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Flashcards in Muscles Deck (34)
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1

What are the Superficial Extrinsic Shoulder Muscles and the Deep Extrinsic Shoulder Muscles?

Superficial:
Trapezius
Latissimus Dorsi
Deep:
Levator Scapulae
Rhomboids

2

What are the Scapulohumeral Muscles?

Deltoid, Teres Major

3

What are the rotator cuff muscles?

Supraspinatous
Infraspinatus
Teres Minor
Subscapularis

4

What are the Trapezius attachments?

Origin - Axial Skeleton (Skull down to T12)
Attachments - Posterior surface of scapula and clavicle

5

What is the Trapezius Innervated by?

Accessory Nerve (C3 and C4)

6

Trapezius actions

Upper fibres rotate and elevate scapula
Middle fibres retract scapula
Lower fibres pull scapula inferiorly

7

How can you test the accessory nerve?

Elevate shoulder against resistance

8

Latissimus Dorsi attachments

Originates thoracic spine, iliac crest and the inferior 3 ribs.
Attaches to intertubecular groove of humerus

9

Latissimus Dorsi innervation

Thoracodorsal nerve

10

Latissimus Dorsi actions

Extension of the arm at the shoulder
Adduction at the shoulder
Medial rotation of the arm

11

Levator Scapulae attachments

Transverse processes of C1-C4 vertebrae
Attaches to the medial border of the scapula, superior to spine

12

Levator Scapulae innervation

Dorsal scapular nerve

13

Levator Scapulae actions

Elevates scapula
Rotates scapula to tilt glenohumeral joint inferiorly

14

Rhomboid attachments

Minor: C7-T1 vertebrae
Major: T2-T5 vertebrae
Attach medial border of scapula

15

Rhomboid innervation

Dorsal scapula nerve

16

Rhomboid Actions

Retracts scapula
Rotates scapula to tilt glenohumeral joint inferiorly
Can also fix the scapula to the thoracic wall

17

Deltoid attachments

Originates: Scapula and Clavicle
Attachments: Deltoid tuberosity on the lateral surface of the humerus

18

Deltoid Innervation

Axillary nerve

19

Deltoid Actions

Anterior: flex the arm at the shoulder
Posterior: extend the arm at the shoulder
Middle: major abductor of the arm 15-90

20

Teres Major attachment

Originate: the inferior angle of the scapula on the posterior side
Attachment: intertubecular groove of the humerus

21

Teres Major innervation

lower subscapular nerve

22

Teres Major actions

Adducts at the shoulder
medially rotates the arm

23

Supraspinatus attachments

Originates from the supraspinous fossa on the posterior surface of the scapula
Attachment: greater tuberosity of the humerus

24

Supraspinatus innervation

suprascapular nerve

25

Supraspinatous Actions

First 15 degrees of arm adduction

26

Infraspinatous attachments

Origin: infraspinous fossa
Attaches: greater tubercle of the humerus

27

Infraspinatous innervation

Innervated by the suprascapular nerve

28

Infraspinatous action

Lateral rotation of the arm

29

Subscapularis attachments

Origin: Subscapularis fossa, costal surface of scapular
Attaches: lesser tubercle of humerus

30

Subscapularis innervation

Upper and lower subscapular nerves