Lecture 6: Notes

Question 1

Define: Hilton’s Law

Answer 1

the nerve supplying the muscles extnding across or acting on a given joint alsosupplies the joint capsule and skin overlying the muscle and distal to the muscle

example: musculocutaneous nerve innervates the coracobrachialis, biceps brachii, and brachialis
- also innervates forearm skin close to insertion of each muscle
- also detects pain and proprioceptive input from the elbow

Question 2

Define: paralysis

Answer 2

loss of function in a muscle or loss of movement (i.e. movement is abolished)

Question 3

Define: weakness or paresis

Answer 3

partial loss of function in a muscle or partial loss of movement

Question 4

Define: numbness

Answer 4

Loss of sensation

Question 5

Define: paresthesia

Answer 5

partial loss of sensation (sensation is abnormal or abolished)

Question 6

Make a flow chart of the veins (make sure to distinguish between superficial and deep)

Answer 6

see slide

Question 7

past the elbow, the musculcutaneous nerve continues as?

Answer 7

lateral cutaneous nerve of the forearm, leading to sensory distribution in the anterior forearm

Question 7

Whats the rule you learned for how the roots contribute to the 5 terminal branches?

Answer 7

Remember this: 3 musketeers, 2 assassins, 4 men, 5 rats, 2 unicorns

Musculocutaneous nerve: C5-C7
Axillary nerve: C5,C6
Median nerve: C6-T1
Radial nerve: C5-T1
Ulnar nerve: C8-T1

Question 8

What is the 1/2 loaf rule?

Answer 8

The median nerve innervates half of the lumbricals and the entire thenar eminence

½ L : 2 radial lumbricals

OAF: opponens pollicis, abductor pollicis brevis, flexor pollicis brevis

Question 9

What is a clue to tell if you’re looking at the dorsal or palmar surface of the hand

Answer 9

Dorsal surface: you can’t see the pisiform or the hook of the hamate

Question 10

what does trapezium form a saddle joint with

Answer 10

The trapezium bone forms a saddle joint with the first metacarpal bone, located at the base of the thumb. This joint, known as the carpometacarpal (CMC) joint of the thumb, allows for a wide range of motion, including flexion, extension, abduction, adduction, and circumduction.