Intrinsic Muscles Flashcards

1
Q

Deltoideus: Insertion

A

Insertion: deltoid tuberosity of the humerus

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2
Q

Deltoideus: Action

A

Action: flex shoulder

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3
Q

Name the two parts of the deltoideus.

A

1) scapular

2) spinal

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4
Q

Infraspinatus: Origin

A

Origin: infraspinous fossa of the scapula

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5
Q

Infraspinatus: Insertion

A

Insertion: lateral side of the greater tubercle of the humerus (small, circumscribed area)

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6
Q

Infraspinatus: Action

A

Action:

1) laterally stabilizes the shoulder
2) abduct and laterally rotate shoulder
3) assists other muscles in the extension or flexion of shoulder

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7
Q

There’s minor: Origin

A

Origin:

1) infraglenoid tubercle of the scapula
2) distal caudal border of scapula

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8
Q

Teres minor: Insertion

A

Insertion: Teres minor tuberosity of humerus

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9
Q

Teres minor: Action

A

Action:

1) laterally stabilizes for shoulder
2) laterally rotate shoulder
3) flex shoulder

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10
Q

Supraspinatus: Origin

A

Origin: supraspinous fossa of the scapula

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11
Q

Supraspinatus: Insertion

A

Insertion: greater tubercle of the humerus

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12
Q

Supraspinatus: Action

A

Action:

1) laterally stabilizes the shoulder
2) extend shoulder

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13
Q

Subscapularis: Origin

A

Origin: subscapular fossa of the scapula

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14
Q

Subscapularis: Insertion

A

Insertion: lesser tubercle of the humerus

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15
Q

Subscapularis: Action

A

Action:

1) Medially stabilizes the shoulder
2) adduct shoulder
3) extend shoulder

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16
Q

Teres major: Origin

A

Origin:

1) caudal angle and caudal border of the scapula
2) subscapularis muscle

17
Q

Teres major: Insertion

A

Insertion: Teres major tuberosity of the humerus

18
Q

Teres major: Action

A

Action: flex shoulder, rotate arm medially

19
Q

Coracobrachialis: Origin

A

Origin: coracoid process of the scapula

20
Q

Coracobrachialis: Insertion

A

Insertion: crest of the lesser tubercle of the humerus, near Teres major tuberosity

21
Q

Coracobrachialis: Action

A

Action: mainly stabilizes the shoulder, but can assist other muscles in adduction and/or extension of shoulder

22
Q

Tensor fasciae antebrachii: Origin

A

Origin: fascia covering the lateral surface of the latissimus dorsi muscle

23
Q

Tensor fasciae antebrachii: Insertion

A

Insertion: olecranon of the ulna

24
Q

Tensor fasciae antebrachii: Action

A

Action: extend elbow

25
Name the 4 heads of the triceps brachii.
1) long head 2) lateral head 3) medial head 4) accessory head
26
Triceps brachii: Origin
Origin: 1) caudal border of the scapula (LONG HEAD) 2) tricipital line
27
Triceps brachii: Insertion
Insertion: olecranon of ulna
28
Triceps brachii: Action
Action: 1) flex shoulder (LONG HEAD) 2) extend elbow
29
Anconeus: Origin
Origin: 1) lateral supracondylar crest of humerus 2) lateral and medial epicondyles of humerus
30
Anconeus: Insertion
Insertion: proximal and lateral aspect of the ulna
31
Anconeus: Action
Action: extend elbow
32
Biceps brachii: Origin
Origin: supraglenoid tubercle of the scapula
33
Biceps brachii: Insertion
Insertion: radial and ulnar tuberosities
34
Biceps brachii: Action
Action: extend shoulder and flex elbow
35
Brachialis: Origin
Origin: proximal and lateral aspect of the humerus
36
Brachialis: Insertion
Insertion: radial and ulnar tuberosities
37
Brachialis: Action
Action: flex elbow
38
Deltoideus: Origin
Origin: spine and acromial process of scapula