WK 10 Major Perioheral Nerve Plexi

Question 0

the cervical plexus supplies the _________________________________________

Answer 0

skin and muscles of the head, neck, superior portion of the shoulders and chest and diaphragm

Question 1

the origin of the cervical plexus is?

Answer 1

C1 - C5

Question 3

name 2 cervical plexus

Answer 3

Ansa cervicalis C1 - C3

Phrenic C3 - C5

Question 4

Ansa Cervicalis belongs to which plexus?

efferent supply?
motor or sensory?
action?

Answer 4

Cervical Plexus

Only Motor
to strap muscles / infrahyoid
stabilize hyoid bone, larynx during speaking and swallowing

Question 5

the brachial plexus supplies…

and its origin?

both motor and sensory?

Answer 5

shoulder and upper limbs

C5 - T1

yes, both efferent fx and afferent supply exists, **EXCEPT for Long Thoracic (only motor)

Question 5

• the major MOTOR action and efferent supply of Musculocutaneous is?
• Afferent supply?

Answer 5

• action: elbow flexion and supination
• efferent: coracobrachialis, brachialis, biceps brachii

-afferent: skin of lateral forearm

Question 6

name 5 nerves that make up the brachial plexus and what is their origin?

Answer 6

musculocutaneous C5 - C6
Radial C5 - T1
Median C6 - T1
Ulnar C7 - T1
Long Thoracic C5 - C7

Question 7

the major MOTOR action and efferent supply of Radial is?

-Afferent?

Answer 7

• action: extension in multiple joints
  (“you’re welcome”)
• Efferent: extensors of the upper extremity
• Afferent: posterior skin of upper extremity and dorsum of lateral 2/3 of the hand, lateral 3.5 fingers

Question 8

the major MOTOR action and efferent supply of Median nerve?

-Afferent?

Answer 8

• action: wrist and lateral finger flexion, wrist abduction thumb movements
  (“all to myself”)
• efferent: forearm flexors (except f. carpi ulnaris and lateral .5 of f. digitorum profundus); intrinsic thumb (thenar) muscles lateral 2 lumbricals
• afferent: palmar skin of the lateral 2/3 of hand and nail beds of lateral 3.5 fingers
• carpal tunnel syndrome

Question 9

the major MOTOR action and efferent supply of Ulnar?

-Afferent?

Answer 9

• action: wrist adduction / flexion; flexion of 2 medial fingers; abduction and adduction of 2th - 5th fingers (“peek-a-boo”)
• efferent: flexor carpi ulnaris and med half of f. digitorum profundus; intrinsic mm. of the little f. (hypothenar); medial 2 lumbricals

-afferent: skin of the medial 3rd of palmar dorsal hand; skin of med. 1.5 fing. (palm and dorsal surface)

Question 10

the major MOTOR action and efferent supply of Long thoracic?

-afferent?

Answer 10

• action: upward rotation of scapula
• efferent: serratus anterior muscle
• afferent: none
• winged scapula, if damaged

Question 11

Phrenic belong to which plexus?

efferent supply?
motor or sensory?
action?

Answer 11

Cervical Plexus

diaphragm
motor only - respiration