Advanced Clinical Anatomy and Neurology of the Musculoskeletal System Quiz

1. Which sensory deficit is most likely present in a patient who presents with Foot in Everted, Dorsiflexed position (Calcaneovagocavus position)?

MEDIAL aspect of the foot, nerve most likely damaged is sural nerve.

DORSAL surface of the foot, nerve most likely damaged is peroneal nerve.

HEEL of the foot, nerve most likely damaged is posterior tibial nerve.

The correct answer can be determined by understanding the specific muscles and movements associated with the tibial nerve innervation, which are affected in the described foot position.

Explanation

The correct answer can be determined by understanding the specific muscles and movements associated with the tibial nerve innervation, which are affected in the described foot position.

2. Why does a tennis player present with chronic pain in the lateral side of the elbow?

The pain is caused by a direct impact to the lateral side of the elbow during a match.

The pain is a result of poor technique while serving.

The pain is due to overuse of flexors in the arm.

The correct answer explains how the repetitive use of extensors leads to Lateral Epicondylitis in tennis players. The incorrect answers propose other potential causes of the pain in the lateral side of the elbow, but they do not align with the typical mechanism of injury in this scenario.

Explanation

The correct answer explains how the repetitive use of extensors leads to Lateral Epicondylitis in tennis players. The incorrect answers propose other potential causes of the pain in the lateral side of the elbow, but they do not align with the typical mechanism of injury in this scenario.

3. When you are clapping your hands with your elbows at your sides, which muscles are involved in bringing your hands together/separating them apart?

Biceps brachii and deltoid

Extensor carpi radialis longus and flexor carpi radialis

Pectoralis major and trapezius

Subscapularis, Teres Minor, and Infraspinatus are the primary muscles involved in bringing the hands together/separating them apart specifically in the scenario described in the question.

Explanation

Subscapularis, Teres Minor, and Infraspinatus are the primary muscles involved in bringing the hands together/separating them apart specifically in the scenario described in the question.

4. What structures are commonly damaged in an injury involving MCL tear due to Valgus stress (lateral) in the knee?

PCL, Medial Meniscus

Patellar Tendon, Quadriceps Tendon

LCL, Posterior Cruciate Ligament

In this specific injury scenario, known as the unhappy triad, the ACL and Lateral Meniscus are commonly damaged along with the MCL. It is important to recognize the pattern of injuries associated with specific mechanisms to provide accurate treatment and management.

Explanation

In this specific injury scenario, known as the unhappy triad, the ACL and Lateral Meniscus are commonly damaged along with the MCL. It is important to recognize the pattern of injuries associated with specific mechanisms to provide accurate treatment and management.

5. A patient who cannot move his shoulder after a traumatic accident has likely injured nerves at what spinal levels?

C8-T1

L3-L4

T5-T6

Injuries at C5-6 levels typically result in shoulder movement deficits due to involvement of the suprascapular nerve, which innervates the supraspinatus muscle responsible for shoulder abduction. The incorrect options do not align with the common nerve injuries associated with shoulder movement impairments.

Explanation

Injuries at C5-6 levels typically result in shoulder movement deficits due to involvement of the suprascapular nerve, which innervates the supraspinatus muscle responsible for shoulder abduction. The incorrect options do not align with the common nerve injuries associated with shoulder movement impairments.

6. When you do passive abduction with the patient's leg in the extended position (or at 30 degrees), on applying Valgus force (lateral), you note medial space widening of the tibia. Which ligament is likely injured?

LCL was likely injured.

ACL was likely injured.

PCL was likely injured.

MCL injury is common with lateral stress (valgus) in football players. Valgus injury often results in unhappy triad: MCL, ACL, lateral meniscus.

Explanation

MCL injury is common with lateral stress (valgus) in football players. Valgus injury often results in unhappy triad: MCL, ACL, lateral meniscus.

7. Which ligament is most likely torn if a patient has abnormal passive adduction (laxity on application of varus stress-Medial force) or lateral tibial space widening when a varus force is applied?

MCL

ACL

PCL

LCL can be damaged when you fall on the medial side of the knee (Varus stress), resulting in abnormal passive adduction or lateral tibial space widening.

Explanation

LCL can be damaged when you fall on the medial side of the knee (Varus stress), resulting in abnormal passive adduction or lateral tibial space widening.

8. Pain/'pop' is elicited on internal rotation of the knee. Where is the patient's injury?

Posterior cruciate ligament (PCL)

Anterior cruciate ligament (ACL)

Patellar tendon

Injuries to the ACL, PCL, and patellar tendon typically present with different symptoms and mechanisms of injury compared to medial or lateral meniscus injuries.

Explanation

Injuries to the ACL, PCL, and patellar tendon typically present with different symptoms and mechanisms of injury compared to medial or lateral meniscus injuries.

9. A baby holds her hand in a pronated position after her brother pulled her by the hand when he was trying to stop her from running into the street. She experiences pain with motion of her right elbow and there is no visible edema. What is the likely diagnosis?

*Subluxation of radial head.

Fracture of the radial head

Sprained wrist

Dislocated shoulder

In this scenario, the baby's symptoms of holding her hand in a pronated position after trauma to the arm, along with pain with motion of the elbow, point towards a subluxation of the radial head. This condition is commonly seen in children after a sudden pull on the arm. Fracture of the radial head, sprained wrist, and dislocated shoulder are less likely based on the given information.

Explanation

In this scenario, the baby's symptoms of holding her hand in a pronated position after trauma to the arm, along with pain with motion of the elbow, point towards a subluxation of the radial head. This condition is commonly seen in children after a sudden pull on the arm. Fracture of the radial head, sprained wrist, and dislocated shoulder are less likely based on the given information.

10. Why is the Medial Femoral condyle on femoral head the most common site of AVN?

*Because it is watershed area between Medial Circumflex Femoral Artery(Retinacular branches) and branch of Obturator artery.

Because it is a non-weight bearing area of the femur.

As a result of direct trauma to the femoral head.

Due to poor blood supply from the Femoral artery.

Avascular necrosis (AVN) commonly affects the Medial Femoral condyle due to its vulnerable location at the watershed area between the Medial Circumflex Femoral Artery and a branch of the Obturator artery, leading to compromised blood supply.

Explanation

Avascular necrosis (AVN) commonly affects the Medial Femoral condyle due to its vulnerable location at the watershed area between the Medial Circumflex Femoral Artery and a branch of the Obturator artery, leading to compromised blood supply.

11. Patient with fracture of the midshaft of the humerus, can't extend his wrist, which nerve/artery was most likely damaged?

Axillary nerve and Brachial artery

Ulnar nerve and Brachial artery

Median nerve and Radial artery

At midshaft of humerus, the most likely nerve to be damaged is Radial nerve which leads to wrist drop, and the most likely artery to be damaged is DEEP brachial artery. Do not confuse it with other possible nerve and artery combinations.

Explanation

At midshaft of humerus, the most likely nerve to be damaged is Radial nerve which leads to wrist drop, and the most likely artery to be damaged is DEEP brachial artery. Do not confuse it with other possible nerve and artery combinations.

12. Cutaneous innervation of forearm?

Radial

Musculocutaneous

Median

*Ulnar Medial*MUSCULOCUTANEOUS LATERAL<KNOW THAT,don't write median nerve.

The correct cutaneous innervation of the forearm includes the ulnar nerve for the medial side and the musculocutaneous nerve for the lateral side. Radial and median nerves do not provide cutaneous innervation to the forearm.

Explanation

The correct cutaneous innervation of the forearm includes the ulnar nerve for the medial side and the musculocutaneous nerve for the lateral side. Radial and median nerves do not provide cutaneous innervation to the forearm.

13. On gait of your patient you note that he leans toward left side when he walks, when he is asked to stand on right leg, his body tilts to the left side(+Trendelenburg sign). Which muscles, nerve on which side is most likely involved?

Quadriceps femoris muscle and femoral nerve on the left side

Tibialis anterior muscle and peroneal nerve on the left side

Sartorius muscle and obturator nerve on the right side

The correct answer involves the gluteus medius and minimus muscles on the right side along with the superior gluteal nerve. The other incorrect options do not align with the symptoms described in the question.

Explanation

The correct answer involves the gluteus medius and minimus muscles on the right side along with the superior gluteal nerve. The other incorrect options do not align with the symptoms described in the question.

14. What is the function of the Rhomboid major muscle?

Provides flexion of the elbow joint.

Moves the shoulder joint in multiple directions.

Assists in breathing by expanding the chest cavity.

The Rhomboid major muscle specifically functions to draw the scapula medially at its border, which helps with movements of the shoulder blade. It is innervated by the Dorsal scapular nerve, responsible for its motor function.

Explanation

The Rhomboid major muscle specifically functions to draw the scapula medially at its border, which helps with movements of the shoulder blade. It is innervated by the Dorsal scapular nerve, responsible for its motor function.

15. What is an important fact to know about the teres major muscle?

Teres major is a part of the rotator cuff muscles.

Teres major is innervated by the axillary nerve.

Teres major functions to laterally rotate the arm.

Teres major is often confused with teres minor, but they have different functions and innervation. It is important to know that teres major is not part of the rotator cuff muscles and is innervated by the Subscapular nerve.

Explanation

Teres major is often confused with teres minor, but they have different functions and innervation. It is important to know that teres major is not part of the rotator cuff muscles and is innervated by the Subscapular nerve.

16. Which muscle is most likely responsible for a patient's inability to adduct/extend the humerus if it is due to damage to the thoracodorsal nerve?

Teres major muscle

Deltoid muscle

Pectoralis major muscle

The latissimus dorsi muscle is innervated by the thoracodorsal nerve, which is responsible for adduction and extension of the humerus.

Explanation

The latissimus dorsi muscle is innervated by the thoracodorsal nerve, which is responsible for adduction and extension of the humerus.

17. Which muscle and nerve are involved when abnormal prominence of the inferior scapular angle is observed on one side when a patient pushes against the wall with both hands?

Trapezius paralysis due to damage to the Spinal Accessory nerve (CN XI) causes scapular winging.

Deltoid muscle strain due to damage to the Axillary nerve leads to scapular winging.

Pectoralis major rupture due to damage to the Medial pectoral nerve results in scapular winging.

18. Why does a subcapsular femoral head fracture could lead to avascular (aseptic) necrosis while a peritrochanteric fracture would not?

Because avascular necrosis is a common complication of both subcapsular and peritrochanteric fractures, but the underlying mechanisms are distinct.

Because subcapsular femoral head fracture occurs predominantly in males, whereas peritrochanteric fracture occurs predominantly in females.

Because peritrochanteric fracture involves more severe trauma compared to subcapsular fracture, leading to different outcomes.

A peritrochanteric fracture is extracapsular and does not affect the blood flow to the femoral head, while a subcapsular fracture damages the critical blood supply from the medial femoral circumflex artery, predisposing to avascular necrosis.

Explanation

A peritrochanteric fracture is extracapsular and does not affect the blood flow to the femoral head, while a subcapsular fracture damages the critical blood supply from the medial femoral circumflex artery, predisposing to avascular necrosis.

19. What does PCL prevent?

PCL prevents LATERAL displacement of femur relative to tibia when the knee is flexed.

PCL prevents POSTERIOR displacement of femur relative to tibia when the knee is flexed.

PCL prevents ROTATIONAL displacement of femur relative to tibia when the knee is flexed.

The PCL prevents anterior displacement of the femur relative to the tibia when the knee is flexed. This is important for maintaining stability in the knee joint.

Explanation

The PCL prevents anterior displacement of the femur relative to the tibia when the knee is flexed. This is important for maintaining stability in the knee joint.

20. The patellar ligament spans from the patella to the tibial tuberosity and is a continuation of which tendon?

Achilles tendon

Hamstring tendon

Biceps femoris tendon

The patellar ligament is actually a continuation of the Quadriceps femoris tendon, which includes vastus medialis, lateralis, intermedius, and rectus femoris muscles. These muscles are powerful extensors, with rectus femoris also acting as a flexor. Damage to the patellar ligament may result in difficulty with leg extension.

Explanation

The patellar ligament is actually a continuation of the Quadriceps femoris tendon, which includes vastus medialis, lateralis, intermedius, and rectus femoris muscles. These muscles are powerful extensors, with rectus femoris also acting as a flexor. Damage to the patellar ligament may result in difficulty with leg extension.

21. Guy who spends a lot of time on his knees (like a roofer, plumber, carpet layer) complains of pain in the knee region/trouble flexing the knee. Symptoms get better with rest. On physical exam you note fluctuant edema over lower pole of the patella on the affected knee, along with swelling, redness, tenderness to palpation, erythema, and crepitance in the affected region. Which bursa is most likely involved?

Suprapatellar bursa

Infrapatellar bursa

Popliteal bursa

Chronic trauma due to excessive kneeling can cause prepatellar bursitis, also known as 'Housemaid's knee'. The prepatellar bursa diminishes friction and ensures maximal movement at the knee. The symptoms mentioned in the question are characteristic of prepatellar bursitis.

Explanation

Chronic trauma due to excessive kneeling can cause prepatellar bursitis, also known as 'Housemaid's knee'. The prepatellar bursa diminishes friction and ensures maximal movement at the knee. The symptoms mentioned in the question are characteristic of prepatellar bursitis.

22. What is the likely cause of a patient being unable to aDDuct the thigh after pelvic surgery with lymph node dissection?

Femoral nerve damage (L2-L4)

Tibial nerve damage (L4-S3)

Sciatic nerve damage (L4-S3)

Obturator nerve damage leads to the inability to aDDuct the thigh and loss of sensation over the medial thigh.

Explanation

Obturator nerve damage leads to the inability to aDDuct the thigh and loss of sensation over the medial thigh.

23. Which muscles are responsible for increasing intra-abdominal and intra-thoracic pressure when performing the Valsava maneuver to promote vagal stimulation?

INTERNAL INTERCOSTAL muscles

EXTERNAL OBLIQUE muscles

DIAPHRAGM muscle

When performing the Valsava maneuver, the RECTUS ABDOMINIS muscles play the biggest role in increasing pressure in the intra-abdominal and intra-thoracic regions. The DIAPHRAGM muscle primarily aids in respiration, while the INTERNAL INTERCOSTAL and EXTERNAL OBLIQUE muscles are not as directly involved in this specific action.

Explanation

When performing the Valsava maneuver, the RECTUS ABDOMINIS muscles play the biggest role in increasing pressure in the intra-abdominal and intra-thoracic regions. The DIAPHRAGM muscle primarily aids in respiration, while the INTERNAL INTERCOSTAL and EXTERNAL OBLIQUE muscles are not as directly involved in this specific action.

24. Which muscle movements are responsible for patient's trouble rising from the sitting position and climbing stairs, and which nerve could have been damaged?

Hamstrings responsible for Flexion of hip and knee, innervated by Sciatic nerve(L4-S3)

Quadriceps Femoris responsible for Flexion of hip and Extension of knee, innervated by Femoral nerve(L2-L4)

Tibialis Anterior responsible for Dorsiflexion and inversion of foot, innervated by Deep fibular nerve(L4-S1)

Multiple muscles and nerves are involved in different movements and actions of the body. In this case, the patient's trouble rising from sitting position and climbing stairs can be attributed to the Gluteus Maximus muscle and the Inferior Gluteal nerve being responsible for specific movements and functions.

Explanation

Multiple muscles and nerves are involved in different movements and actions of the body. In this case, the patient's trouble rising from sitting position and climbing stairs can be attributed to the Gluteus Maximus muscle and the Inferior Gluteal nerve being responsible for specific movements and functions.

Advanced Clinical Anatomy and Neurology of the Musculoskeletal System Quiz

1. Which sensory deficit is most likely present in a patient who presents with Foot in Everted, Dorsiflexed position (Calcaneovagocavus position)?

2.

What first name or nickname would you like us to use?

2. Why does a tennis player present with chronic pain in the lateral side of the elbow?

3. When you are clapping your hands with your elbows at your sides, which muscles are involved in bringing your hands together/separating them apart?

4. What structures are commonly damaged in an injury involving MCL tear due to Valgus stress (lateral) in the knee?

5. A patient who cannot move his shoulder after a traumatic accident has likely injured nerves at what spinal levels?

6. When you do passive abduction with the patient's leg in the extended position (or at 30 degrees), on applying Valgus force (lateral), you note medial space widening of the tibia. Which ligament is likely injured?

7. Which ligament is most likely torn if a patient has abnormal passive adduction (laxity on application of varus stress-Medial force) or lateral tibial space widening when a varus force is applied?

8. Pain/'pop' is elicited on internal rotation of the knee. Where is the patient's injury?

9. A baby holds her hand in a pronated position after her brother pulled her by the hand when he was trying to stop her from running into the street. She experiences pain with motion of her right elbow and there is no visible edema. What is the likely diagnosis?

10. Why is the Medial Femoral condyle on femoral head the most common site of AVN?

11. Patient with fracture of the midshaft of the humerus, can't extend his wrist, which nerve/artery was most likely damaged?

12. Cutaneous innervation of forearm?

13. On gait of your patient you note that he leans toward left side when he walks, when he is asked to stand on right leg, his body tilts to the left side(+Trendelenburg sign). Which muscles, nerve on which side is most likely involved?

14. What is the function of the Rhomboid major muscle?

15. What is an important fact to know about the teres major muscle?

16. Which muscle is most likely responsible for a patient's inability to adduct/extend the humerus if it is due to damage to the thoracodorsal nerve?

17. Which muscle and nerve are involved when abnormal prominence of the inferior scapular angle is observed on one side when a patient pushes against the wall with both hands?

18. Why does a subcapsular femoral head fracture could lead to avascular (aseptic) necrosis while a peritrochanteric fracture would not?

19. What does PCL prevent?

20. The patellar ligament spans from the patella to the tibial tuberosity and is a continuation of which tendon?

22. What is the likely cause of a patient being unable to aDDuct the thigh after pelvic surgery with lymph node dissection?

23. Which muscles are responsible for increasing intra-abdominal and intra-thoracic pressure when performing the Valsava maneuver to promote vagal stimulation?

24. Which muscle movements are responsible for patient's trouble rising from the sitting position and climbing stairs, and which nerve could have been damaged?