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Anatomy - Thoracic Wall
SUNY Upstate College of Medicine Class of 2015
10
Anatomy
Graduate
09/11/2011

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Term
External Intercostal Muscles
Definition

The fibers course anteriorly and inferiorly ("hands in pocket"). External intercostal membrane replaces them in the region of the costal cartilages.

 

Stabilize ribs and thoracic cage during inspiration and expiration and elevate and depress the ribs during forced respiratory movements.

 

Innervated by anterior intercostal nerves.

 

Term
Internal Intercostal muscles
Definition

Course at right angles to those

of the external. They begin at the lateral

margin of the sternum.

 

Same functions and innervation as external.

Term
Transversus Thoracis Muscles
Definition

The most anterior of

these, the

transversus thoracis muscles

are deep to and cover part of, the internal

thoracic artery.

Term
Internal thoracic Artery
Definition

Supply blood to chest wall.

 

Branch of subclavian artery.

 

Run lateral to margin of sternum.

 

Gives off 6 anterior intercostal arteries before dividing into two terminal branches: Superior epigastric and musculophrenic.

Term
Anterior intercostal arteries
Definition

Run along underneath ribs.

 

Can form functional and anastomotic connections with Posterior intercostal arteries.

 

There are 6 that come off the internal thoracic artery

Term
Internal thoracic Vein
Definition
Follows same course as artery and drains into superior epigastric and musculophrenic veins.
Term
Intercostal Nerve
Definition

AKA - ventral ramus of T1-T11 spinal nerves.

 

Supply both motor and sensory fibers to muscles and skin of chest wall.

 

Sensory fibers parietal pleura lining inside of chest cavity.

 

And postganglionic sympathetic fibers to lateral and anterior cutaneous branches.

Term
Common site of rib fracture
Definition
Angle of the rib
Term
External intercostal muscles
Definition

Active during inspiration and elevate the ribs and prevent intercostal spaces from bulging out or being drawn in.

 

Innervated by intercostal nerves.

 

11 intercostal muscles

Term
Internal intercostal muscles
Definition

Interconnect the costal cartilages.

 

Innervated by intercostal nerves.

 

Perpendicular to external intercostal muscles.

 

 

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