Symptoms Of Brachial Plexus Quiz

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2. Where does the axillary nerve come from?

The axillary nerve originates from the posterior cord of the brachial plexus. The brachial plexus is a network of nerves that innervates the upper limb. It is formed by the fusion of nerve roots from the spinal cord. The posterior cord gives rise to several nerves, including the axillary nerve, which supplies the deltoid and teres minor muscles.

Explanation

The axillary nerve originates from the posterior cord of the brachial plexus. The brachial plexus is a network of nerves that innervates the upper limb. It is formed by the fusion of nerve roots from the spinal cord. The posterior cord gives rise to several nerves, including the axillary nerve, which supplies the deltoid and teres minor muscles.

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4. What does the medial cord become?

The medial cord is one of the three main branches of the brachial plexus, a network of nerves that innervates the upper limb. It gives rise to several nerves, including the ulnar nerve. The ulnar nerve is responsible for providing sensory and motor innervation to the muscles of the forearm and hand. Therefore, the correct answer is ulnar nerve because it is the nerve that originates from the medial cord of the brachial plexus.

Explanation

The medial cord is one of the three main branches of the brachial plexus, a network of nerves that innervates the upper limb. It gives rise to several nerves, including the ulnar nerve. The ulnar nerve is responsible for providing sensory and motor innervation to the muscles of the forearm and hand. Therefore, the correct answer is ulnar nerve because it is the nerve that originates from the medial cord of the brachial plexus.

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5. What nerve innervates lat dorsi?

The thoracodorsal nerve innervates the latissimus dorsi muscle. This nerve arises from the posterior cord of the brachial plexus and provides motor innervation to the latissimus dorsi muscle, which is responsible for adduction, extension, and medial rotation of the arm at the shoulder joint.

Explanation

The thoracodorsal nerve innervates the latissimus dorsi muscle. This nerve arises from the posterior cord of the brachial plexus and provides motor innervation to the latissimus dorsi muscle, which is responsible for adduction, extension, and medial rotation of the arm at the shoulder joint.

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6. Where does the medial pectoral nerve come from?

The medial pectoral nerve originates from the medial cord of the brachial plexus. It arises from the anterior rami of the spinal nerves C8 and T1.

Explanation

The medial pectoral nerve originates from the medial cord of the brachial plexus. It arises from the anterior rami of the spinal nerves C8 and T1.

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8. What is the lateral cutaneous nerve to the forearm a branch of?

The lateral cutaneous nerve to the forearm is a branch of the musculocutaneous nerve. This nerve originates from the brachial plexus and supplies sensory innervation to the lateral aspect of the forearm. The musculocutaneous nerve also provides motor innervation to the muscles in the anterior compartment of the arm, including the biceps brachii, brachialis, and coracobrachialis. Therefore, it is responsible for both sensory and motor functions in the forearm and plays an important role in the overall function of the upper limb.

Explanation

The lateral cutaneous nerve to the forearm is a branch of the musculocutaneous nerve. This nerve originates from the brachial plexus and supplies sensory innervation to the lateral aspect of the forearm. The musculocutaneous nerve also provides motor innervation to the muscles in the anterior compartment of the arm, including the biceps brachii, brachialis, and coracobrachialis. Therefore, it is responsible for both sensory and motor functions in the forearm and plays an important role in the overall function of the upper limb.

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9. What joins together to form the median nerve?

The median nerve is formed by the joining of the medial and lateral cords. These cords are part of the brachial plexus, a network of nerves that originate from the spinal cord in the neck and supply the upper limbs. The medial cord contains fibers from the lower trunk of the brachial plexus, while the lateral cord contains fibers from the upper and middle trunks. When these cords come together, they form the median nerve, which innervates muscles in the forearm and hand, as well as providing sensory information from these areas.

Explanation

The median nerve is formed by the joining of the medial and lateral cords. These cords are part of the brachial plexus, a network of nerves that originate from the spinal cord in the neck and supply the upper limbs. The medial cord contains fibers from the lower trunk of the brachial plexus, while the lateral cord contains fibers from the upper and middle trunks. When these cords come together, they form the median nerve, which innervates muscles in the forearm and hand, as well as providing sensory information from these areas.

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11. What does the ulnar nerve supply?

Intrinsic muscles of the hand

Thenar muscles

Medial half of FDP

Lateral half of FDP

FCU

The ulnar nerve supplies the intrinsic muscles of the hand, which are responsible for fine motor movements and control of the fingers. It also supplies the medial half of the flexor digitorum profundus (FDP) muscle, which helps in flexing the fingers. Additionally, the ulnar nerve supplies the flexor carpi ulnaris (FCU) muscle, which is involved in flexion and adduction of the wrist.

Explanation

The ulnar nerve supplies the intrinsic muscles of the hand, which are responsible for fine motor movements and control of the fingers. It also supplies the medial half of the flexor digitorum profundus (FDP) muscle, which helps in flexing the fingers. Additionally, the ulnar nerve supplies the flexor carpi ulnaris (FCU) muscle, which is involved in flexion and adduction of the wrist.

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