Spinal Nerves
Provide the correct number of pairs of spinal nerves in each of the following regions (cervical, thoracic, lumbar, sacral, and coccygeal).
8 cervical, 12 thoracic, 5 lumbar, 5 sacral, 1 coccygeal
The cervical plexus is derived from what? (Be specific)
Ventral rami of C1-C4
What is the brachial plexus derived from? (Be specific)
Ventral rami of C5-C8, T1
Which terminal branch arises from just the medial cord?
Ulnar nerve
Which structure of the spinal cord carries only motor nerve fibers.
Ventral roots
What specific nerve is derived from the cervical plexus and innervates the diaphragm?
Phrenic nerve
Provide the correct order of the structures/sections of the brachial plexus.
Roots, trunks, divisions, cords, terminal branches
Which terminal branch is derived from ventral rami of C5-C7?
Musculocutaneous
Which structure of the spinal cord supplies the extremities (be specific)?
Ventral rami
What is the phrenic nerves derived from?
Ventral rami of C3, C4, and C5
Identify all of the terminal branches (5 total).
Musculocutanous, axillary, medial, ulnar, and radial nerves
Which terminal branch supplies cutaneous innervation to the palmar aspect of digits 1-3 and the lateral half of digit 4?
Median nerve
What type of nerve fibers to dorsal rami carry?
Mixture of motor and sensory nerve fibers
Identify a part/parts of the body that is innervated by the cervical plexus?
- Motor innervation to muscles of neck region
- Cutaneous inn. to skin of neck and sides of head
Lateral Antebrachial Cutaneous Nerve is a continuation of which nerve? What does it supply?
- Musculocutaneous nerve
- cutaneous inn. to skin on lateral forearm
Which terminal branch supplies the majority of the small hand muscles?
Ulnar nerve
At what point do spinal nerves become part of the PNS?
Once they exit through the intervertebral foramina.
T/F: Trapezius is innervated by the cervical plexus
False
Describe the position of the ulnar nerve (2 parts to the answer)
- lies posterior to medial epicondyle of humerus
- along groove for ulnar nerve
Which terminal branch innervates deltoid and teres minor muscles?