Anterior and Posterior Thorax Muscle Flashcards Preview

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Flashcards in Anterior and Posterior Thorax Muscle Deck (52)
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1

Muscles can be named after these three things

Action, Shape, Location (origin and insertion)

2

These muscles attach the upper limb to the axial skeleton via the pectoral girdle

Muscles of the anterior and posterior thorax

3

These muscle stabilize the shoulder and move the scapula

Muscles of the anterior and posterior thorax

4

Name the 6 muscles of the anterior thorax

1. Pectoralis Minor
2. Serratus Anterior
3. Subclavius
4. Sternocleidomastoid
5. Anterior Scalene
6. Pectoralis Major

5

A triangular shaped muscle with the apex attached to the coracoid process, distally attached to ribs 3-5

Pectoralis Minor

6

Located on the anterior wall of thorax and is covered by pectoralis major muscle

Pectoralis Minor

7

Innervation of the pectoralis minor

medial pectoral nerve

8

Stabilizes the scapula through the coracoid process, and can sometimes lift the ribs up

Pectoralis Minor

9

Muscle with scalloped origin, serratis saw, sometimes called the boxers muscle

Serratus Anterior

10

Holds the scapula against the chest wall and is important to protract the scapula

Serratus Anterior

11

Needed to elevate the arm above 90 degrees by rotating laterally, paralysis would inhibit raising arm above 90 degrees

Serratus Anterior

12

Origin and insertion of serratus anterior

Origin: Lateral aspects of ribs 1-8

Insertion: Posteriorly to vertebral border of scapula

13

Innervatation of the serratus anterior

the long thoracic nerve

14

Small muscle lying below the clavicle and holds the clavicle in the sternoclavicular joint

Subclavius

15

Protects the underlying subclavian vessels if there is a fracture of the clavicle, which could pierce the subclavian artery which supplies the upper extremity

Subclavius

16

Origin and insertion of the subclavius

Origin: Costal cartilage of rib one

Insertion: Inferior surface of the lateral third of the clavicle

17

Innervation of the clavicle is the nerve to the ___ which is a branch of the brachioplexus

Subclavius

18

Action is to stabilize the pectoral girdle and help to depress the shoulder

Subclavius

19

The anterior neck muscle with two heads, one clavicular and the other sternal

Sternocleidomastoid

20

Attaches pectoral girdle to the axial skeleton and bilaterally flexes head foward

Sternocleidomastoid

21

Unilaterally flexes head to the same side

Sternocleidomastoid

22

The sternocleidomastoid is innervated by

the spinal accessory nerve (cranial nerve 11)

23

Bilaterally contracted causes head to move forward

Sternocleidomastoid

24

Group of three muscles located beneath the sternocleidomastoid

Scalene (Anterior, Middle, and Posterior)

25

Lies directly deep to sternocleidomastoid muscle

Anterior Scalene

26

Origin and insertion of anterior scalene

Origin: Cervical Transverse Processes 3/4-6

Insertion: Rib one

27

Innervation of the anterior scalene

Branches of cervical spinal nerves

28

If contracted, it depends on which part is fixed

Neck is fixed -> ribs will elevate as in deep inspiration

If rib is fixed -> neck flexes forward, especially when contracting bilaterally

One side is contracted -> lateral flexion to same side

Anterior Scalene

29

A very large artery runs posterior to the anterior scalene

Subclavian Artery

30

Covers the sternocleidomastoid and is considered a muscle of facial expression

Platysma