Term
| What are muscles of the anterior thorax? |
|
Definition
1. pectoralis minor
2. serratus anterior
3. subclavius
4. pectoralis major
5. sternocleidomastoid
6. anterior scalene |
|
|
Term
| What are the characteristics of the pectoralis minor? |
|
Definition
-deep to pectoralis major
-triangular shape
-has 3 heads |
|
|
Term
| What is the origin and insertion of the pectoralis minor? |
|
Definition
O: ribs 3-5
I: corocoid process |
|
|
Term
| What are the actions and innervation of the pectoralis minor? |
|
Definition
A: scapula depression and tilt
N: pectoral nerves |
|
|
Term
| What are the characteristics of the serratus anterior? |
|
Definition
-located on lateral ribcage
-mostly superficial
-has a saw-like appearance |
|
|
Term
| What is the origin and insertion of the serratus anterior? |
|
Definition
O: ribs 1-9
I: anterior surface of scapula |
|
|
Term
| What are the actions and innervation of the serratus anterior? |
|
Definition
A: scapula protraction, depression, and rotation; stabilizes scapula to prevent "winging"
N: long thoracic nerve |
|
|
Term
| What is significant about the long thoracic nerve? |
|
Definition
| it runs very superficial and can be easily damaged or paralyzed |
|
|
Term
| What are the characteristics of the subclavius? |
|
Definition
| -under the clavicle (deep and inferior) |
|
|
Term
| What is the origin and insertion of the subclavius? |
|
Definition
O: 1st rib costal cartilage
I: inferior clavicle |
|
|
Term
| What are the actions and innervation of the subclavius? |
|
Definition
A: stabilizes clavicle
N: brachial plexus |
|
|
Term
| What are the characteristics of the sternocleidomastoid? |
|
Definition
-two heads
-large, superficial muscle seen running obliquely across neck
-powerful rotator/flexor |
|
|
Term
| What is the origin and insertion of the sternocleiodmastoid? |
|
Definition
O: manubrium and medial 1/3 clavicle
I: mastoid process |
|
|
Term
| What are the actions and innervation of the sternocleidomastoid? |
|
Definition
A: cervical forward flexion, contralateral rotation and ipsilateral lateral flexion
N: spinal accessory nerve |
|
|
