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Week 6
Lecture 2
14
Anatomy
Undergraduate 2
10/31/2014

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Cards

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
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