Anato Block II: Arm Flashcards

1
Q

What are the compartments of the arm?

A

The anterior compartment, which contains most of the flexor muscles of the elbow/forearm

The posterior compartment, which contains most of the extensor muscles of the elbow/ forearm

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2
Q

What are the muscles of the anterior compartment of the arm?

A

Flexors of the fore arm
1. Biceps brachii
2. Coracobrachialis
3. Brachialis

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3
Q

Which nerve innervates the muscles of the anterior compartment of the arm?

A

musculocutaneous nerve (ramification of axillar brachial plexus)

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4
Q

What are the muscles of the posterior compartment of the arm?

A

Extensors of the forearm
1. Triceps brachii
2. Aconeus

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5
Q

Which nerve innervates the muscles of the posterior compartment of the arm?

A

Radial nerve

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6
Q

What passes through the quadrangular space?

A

axillary nerve and posterior circumflex humeral artery passes through here to irrigate posterior part of arm

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7
Q

quadrangular space edges:

A

inferior: teres major
posterior: long head of tricep
anterior: lateral head of tricep
superior: subscapular

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8
Q

Proximal attachment of the biceps brachii [origin]

A

short head: tip of coracoid process of scapula
long head: supraglenoid tubercle of scapula

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9
Q

Distal attachment of biceps brachii [insertion]

A

Tuberosity of radius and fascia of forearm via bicipal aponeurosis

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10
Q

Innervation of biceps brachii

A

musculocutaneous neve (c5, C6, c7)

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11
Q

Action of biceps brachii

A

Supinates forearm and when it is supine flexes fore arm

short head resists dislocation of shoulder

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12
Q

Proximal attachment of the coracobrachialis [origin]

A

Tip of coracoid process of scapula

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13
Q

Distal attachment of the coracobrachialis [insertion]

A

Middle third of media surface of humerus

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14
Q

Innervation of coracobrachialis

A

musculocutaneous neve (c5, C6, c7)

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15
Q

Action of coracobrachialis

A

Helps flex and adduct arm

resists dislocation of shoulder

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16
Q

Proximal attachment of the brachialis [origin]

A

Distal half of anterior surface of humerus

17
Q

Distal attachment of the brachialis [insertion]

A

Coronoid process and tuberosity of ulna

18
Q

Innervation of brachialis

A

musculocutaneous neve (c5, c6) and radial nerve (c5, c7)

19
Q

Action of brachialis

A

Flexes forearm in all positions

20
Q

Proximal attachment of the triceps brachii [origin]

A

Long head: infraglenoid tubercle of scapula

Lateral head: posterior surface of humerus, superior to radial groove

Medial head: posterior surface of humerus, inferior to radial groove

21
Q

Distal attachment of the triceps brachii [insertion]

A

Proximal end of olecranon of ulna and fascia of forearm

22
Q

Innervation of triceps brachii

A

Radial Nerve (c6, C7, C8)

23
Q

Action of triceps brachii

A

Chief extensor of forearm

long head resists dislocation of humerus

important for adduction

24
Q

Proximal attachment of the anconeus [origin]

A

Lateral epicondyle of humerus

25
Q

Distal attachment of the anconeus [insertion]

A

Lateral surface of olecranon and superior part of posterior surface of ulna

26
Q

Innervation of anconeus

A

Radial nerve (c7, c8, t1)

27
Q

Action of anconeus

A

Assists triceps in extending forearm

stabilizes elbow joint

may abduct ulna during pronation

28
Q
A