Brachial Plexus Quiz Questions And Answers

The breakdown of the brachial plexus involves four main components: roots, trunks, divisions, and cords. The roots are formed by the spinal nerves C1-7 and T1, which then combine to form three trunks. These trunks further divide into six divisions, and the divisions ultimately form three cords. The cords give rise to the major nerves(end branches) that innervate the upper limb. This hierarchical structure allows for the organization and distribution of nerve fibers from the spinal cord to the arm.

Innervation refers to the process of supplying an organ or tissue with nerves. It involves the transmission of nerve impulses to control and regulate the functioning of that particular area. Therefore, the correct answer is "I do indeed, innervation means to supply with nerves."

The term "cervical" refers to the neck. It is commonly used to describe the region of the spine that is located in the neck area. The cervical spine consists of seven vertebrae and is responsible for supporting the head and allowing for movement and flexibility.

The word "plexus" refers to a bundle of something, and in this case, it specifically refers to a bundle of nerve fibers.

The correct answer is "the spinal cord at C-5 through T-1 (C5,6,7,8 and T-1)". This means that the root exits off the spinal cord at the levels between the fifth cervical vertebra (C5) and the first thoracic vertebra (T1). This includes the roots at C5, C6, C7, C8, and T1.

The brachial plexus is a network of nerves that originates from the spinal cord in the neck and supplies innervation to the upper extremities. This means that it provides the necessary nerve signals for movement and sensation in the arms, hands, and fingers. It does not supply blood to the upper extremities or innervation to the lower extremities.

The correct answer is Axillary, median, and Musculocutaneous. These are the five major nerves in the upper extremity. The axillary nerve innervates the shoulder joint and deltoid muscle. The median nerve supplies sensation to the palm and the flexor muscles of the forearm. The musculocutaneous nerve innervates the biceps, brachii muscle and the sensory skin of the lateral forearm. Ulnar and radial nerves are also major nerves in the upper extremity, responsible for innervating different muscles and providing sensation to specific areas.

The origin of the peripheral nervous system (PNS) is located in the brachial plexus. The brachial plexus is a network of nerves that originates from the spinal cord in the neck region and extends into the arm. It is responsible for the innervation of the upper limb, controlling the movement and sensation in the arm, forearm, and hand. Therefore, the brachial plexus is the correct answer for the origin of the PNS.

The term "lumbar" refers to the lower back region of the body. It is specifically related to the five vertebrae in the lower part of the spine, known as the lumbar vertebrae. This area is responsible for supporting the weight of the upper body and providing flexibility and movement. 

The brachial plexus is a network of nerves that originates from the cervical area of the spine. It is responsible for innervating the muscles of the upper limb and providing sensory information to the arm. Therefore, the correct answer is cervical area.

The correct answer is brachial plexus and lumbar plexus. The brachial plexus is a network of nerves that originates from the spinal cord in the neck region and supplies the upper limb. The lumbar plexus is another network of nerves that originates from the spinal cord in the lower back region and supplies the lower limb. These two areas of enlargement, or bulges, refer to the specific locations where these plexuses are formed and where the nerves bundle together before branching out to supply their respective regions of the body.

The correct answer is 2, dorsal scapular, Long thoracic. The root mentioned in the question refers to the brachial plexus, which is a network of nerves that originates from the spinal cord in the neck region. The dorsal scapular nerve and the long thoracic nerve are both branches of the brachial plexus. The dorsal scapular nerve innervates the rhomboid muscles, while the long thoracic nerve innervates the serratus anterior muscle. Therefore, option 2 is the correct answer as it correctly identifies the nerves that arise from the root.

Trunks are formed when the roots come together to combine. These trunks are located at the level of the scalene muscles. The upper, middle, and lower trunks are formed by the combination of these roots. The trunks play a crucial role in the brachial plexus, which is a network of nerves that supply the upper limb. Therefore, the correct answer is "where roots come together to combine, forming upper, middle, and lower trunks (at the level of the scalene muscles)."

The spinal cord has two areas of enlargement or "bulges." One is in the cervical area, which is located in the neck area, and the other is in the lumbar area, which is in the lower back area.

The long thoracic nerve innervates the pectoral muscles, which keep the scapula (shoulder blade) in position at the posterior thoracic wall. The long thoracic nerve is a motor nerve that arises from the brachial plexus, a network of nerves that innervates the upper limb. Damage to the long thoracic nerve can result in a condition called winged scapula, where the scapula protrudes from the back, particularly when pushing against resistance.

The dorsal scapular nerve is susceptible to stretch injury. This means that when the nerve is stretched beyond its normal range of motion, it can become damaged or injured. Stretching the nerve can cause it to become compressed or irritated, leading to symptoms such as pain, weakness, or numbness in the affected area. It is important to avoid excessive stretching or straining of the dorsal scapular nerve to prevent injury.