Question

The anterior rami of the brachial plexus are the continuations of the anterior rami of spinal nerves ____________ . These rami emerge from the intervertebral foramina and travel through the neck. The five rami unite to form the superior, middle, and inferior ____________ in the posterior triangle of the neck. Nerves ____________ unite to form the superior trunk; nerve ____________ remains as the middle trunk; and nerves ____________ unite to form the inferior trunk. Portions of each trunk divide deep to the clavicle into an anterior and a posterior ____________ . These primarily contain axons that innervate the anterior and posterior parts of the ____________ . Upon reaching the axilla, they converge to form three ____________ .

Answer 1

The anterior rami of the brachial plexus are the continuations of the anterior rami of spinal nerves  C5-T1 . These rami emerge from the intervertebral foramina and travel through the neck. The five rami unite to form the superior, middle, and inferior trunks  in the posterior triangle of the neck. Nerves C5, C6 unite to form the superior trunk; nerve C7 remains as the middle trunk; and nerves C8,T1 unite to form the inferior trunk. Portions of each trunk divide deep to the clavicle into an anterior and a posterior division. These primarily contain axons that innervate the anterior and posterior parts of the upper limb. Upon reaching the axilla, they converge to form three cords.

Answer 2

Answer:

The correct terms are -  

C5-T1,

trunks,

C5 and C6,

C7,

C8, and T1,

division,

upper limb,

cords.

Explanation:

The brachial plexus is a nerve fiber network that supplies the muscle system and skin of the upper limb of the body. It supplies through the whole upper limit or extremity, initiates in the root of the neck.

The brachial plexus is made up of the anterior divisions called anterior rami of cervical spinal nerves C5 TO C8 and T1, the first thoracic spinal nerve.

The plexus is divided into root, trunk, division, cords, and branches for the easy understanding and to help in explaining but there no functional differences between them.