Nerves and Plexus

The brachial plexus consists of the ventral rami of the following:

• C4, C5, C6, C7, T1

• C5, C7, C8, C9, C10

• C5, C6, C7, C8, T1

• C6, C7, C8, T1, T2

Identify the correct statements:

• Lateral wall of axilla is mostly mostly bone, the radius + ulna.

• Medial wall of axilla runs against the serratus anterior and thoracic cage.

• Anterior wall of axilla is mostly the pectoralis major and pectoralis minor.

• Lateral wall of axilla is mostly bone, the humerus.

• Medial wall of axilla runs obliquely to the clavicle.

This groove in the humerus, sits in between the greater and lesser tuberosities.

• Tubercular groove

• Tuborositous groove

• Intertubercular groove

• Intertubated groove

The apex of the axilla is behind the _________.

• angle of Louis

• sternum

• scapula

• clavicle

Which best describes a plexus?

• an intermingling of dorsal rami nerve fibers

• an intermingling of ventral rami nerve fibers

• an intermingling of dorsal root ganglions

• an intermingling of sympathetic chain fibers

What best describes the end result of the intermingling of ventral rami nerve fibers in a plexus?

• The peripheral nerves can now converge into the sympathetic chain ganglia.

• Each peripheral nerve now has it's own blood supply.

• The peripheral nerves now can innervate muscles over a longer distance.

• Each peripheral nerve now contains fibers from several ventral rami.

Several muscles may receive fibers from a single ventral root.

• True

• False

Which nerves contain axons from C5, C6, C7, C8, and T1.

• Musculocutaneous nerve

• Axillary nerve

• Radial nerve

• Median nerve

• Ulnar nerve

Which nerves contain axons from C5, C6, and C7?

• Musculocutaneous nerve

• Axillary nerve

• Radial nerve

• Median nerve

• Ulnar nerve

Which nerves contain axons from C7, C8, and T1?

• Musculocutaneous nerve

• Axillary nerve

• Radial nerve

• Median nerve

• Ulnar nerve