Question

Date 1 What spinal nerve roots provide fibers to the brachial plexus? 2 Name the five major peripheral nerves that originate from the brachial plexus. 3 For each of the muscles listed, indicate one major action that results when this muscle contracts. Use your textbook as a resource. Biceps brachii Brachialis Deltoid Extensor carpi flexion at the elbow radialis /ulnaris) Extensor digitorum Flexor carpi radialis (radialis/ ulnaris) Flexor digitorum (superficialis/ profundus) Infraspinatus Levator scapulae Rhomboideus Triceps brachii Serratus anterior Supraspinatus

Answer 1

The brachial plexus is a complex neural network of nervous tissue that comprised of fibres which formed by lower cervical and upper thoracic ventral nerve roots which supplies motor and sensory innervation to the upper limb and pectoral girdle. It is located in the neck extending into the axilla posterior to the clavicle.

Musculocutaneous Nerve, Axillary Nerve, Median Nerve,Radial Nerve, Ulnar Nerve are the five major Peripheral nerves that originate from the brachial plexus

Bicep Brachi : Flexion at the elbow

Brachialis: primary flexor of forearm

Deltoid: Abduct the arm

Extensor digitorum: Extension

Flexor carpi radialis (radialis/ Ulnaris): Radiating

Flexor digitorum (Superficialis/profundus): Flexion

Infraspinatus: outward rotate and abduct of the humerus and a flexor or extensor of the

shoulder joint

Leavator Scapulae: The scapula to do downward rotation

Rhomboideus: craniomedial movement of the scapula (adduction and elevation)

Tricep brachii: primary extensor of forearm

Serratus anterior: ventrolateral movement of the scapula along the ribs

Supraspinatus: Abducts the humerus at the glenoid socket