Arm Flashcards

1
Q

Anterior compartment muscles of the arm

A

biceps brachii, brachialis and coracobrachialis

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2
Q

All anterior compartment muscles of the arm are innervated by …

A

musculocutaneous nerve

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3
Q

Posterior compartment muscles of the arm and their innervation…

A

triceps brachii, anconeus

radial nerve

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4
Q

The short head of the biceps brachii originates from the..

A

coracoid process

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5
Q

The long head of the biceps brachii originates from the … runs through the glenohumeral joint over the head of the humerus and inside the ….groove where it is fixed in place by the…. ligament.

A

supraglenoid tubercle
intertubercular groove
transverse humeral ligament

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6
Q

The pec major keeps the long head tendon of the biceps brachii in the intertubercular groove by …

A

inserting on the lateral lip

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7
Q

Distal end of the biceps brachii forms a tendon which attaches to the …

A

tuberosity of radius

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8
Q

Biceps brachii function

A

flexes the arm and forearm

supinates the forearm when elbow is flexed at 90 degrees

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9
Q

Biceps tendonitis affects the tendon of the …

A

long head

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10
Q

Most injuries occur during … contraction

A

eccentric

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11
Q

Brachialis muscle lies deep to the biceps and is a major…..

A

elbow flexor

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12
Q

The origin of the brachialis ..

Insertion?

A

O: distal half of anterior surface of the humerus
I: coronoid process and tuberosity of ulna

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13
Q

Innervation of brachialis muscle

A

musculocutaneous

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14
Q

Origin and insertion of coracobrachialis

A

O: coracoid process
I: middle 1/3 of humerus

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15
Q

Innervation of coracobrachialis?

A

musculocutaneous nerve

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16
Q

Function of coracobrachialis?

A

flexes and adducts the shoulder

17
Q

Median nerve runs … to coracobrachialis muscle and the musculocutaneous nerve runs … to the inferior portion of the muscle.

A

deep

anterior

18
Q

Long head of triceps origin? Lateral and medial head?

A

infraglenoid tubercle

posterior of humerus

19
Q

Insertion of triceps?

A

olecranon process of ulna

20
Q

Musculocutaneous nerve comes from the …. pierces the …. innervates … and ends as the ….

A

lateral cord of the brachial plexus
coracobrachialis muscle
all three anterior flexors of the arm
lateral cutaneous nerve of the forearm

21
Q

Symptoms of musculocutaneous nerve injury

A

paralysis of coracobrachialis, biceps and brachialis muscles.
weakened shoulder flexions, weakended forearm flexions and supination. loss of lateral sensation on the forearm

22
Q

Radial nerve is the direct continuation of the …

A

posterior cord of the brachial plexus

23
Q

Deep branch of the radial nerve aka…. supplies …. and elbow joint. Superficial branch supplies…

A

posterior interosseous nerve
forearm muscles
skin of dorsum and hand/digits

24
Q

Symptoms of radial nerve injury before branches:

After?

A

paralysis of triceps (loss of elbow extension), extensor muscles of wrist and digits
same but no loss of tricep function

25
Median nerve has ... branches in the arm
no
26
Ulnar nerve innervates .... and has ... branches in the arm.
elbow joint | no
27
Myotomes: C5, C6, C7, C8, T1
``` shoulder abduction elbow flexion elbow extension wrist extension abd/adduction of fingers ```