Dissection 2.1 - Superficial Thorax

Body of the sternum

Part of sternum between manubrium and xiphoid process

Cephalic vein

Vein located between deltoid and pectoralis major

Body of the sternum

Part of sternum between manubrium and xiphoid process

Cephalic vein

Vein located between deltoid and pectoralis major

Cephalic v. → Axillary v. → Subclavian v. → Brachiocephalic v. → Superior vena cava → Right atrium

Path of cephalic v. to R atrium

Clavicle

Bone located superficial to structures of the neck and thorax but deep to muscles of the thorax

SCM and Platysma

What muscles attach to the clavicle?

Corpus (body) of the mandible

Section of the mandible between the mental protuberance and ramus

Costal cartilage

Hyaline cartilage that connects the ribs to the sternum

Costal groove

Groove located on the inferior border of ribs 2 to 12

By pulsations of the intercostal a.

How is the costal groove formed?

Intercostal VAN

What lays within the costal groove?

Inferior border of the ribcage

Costal margin

Costochondral joint

Joint between costal cartilage and rib

Dermatome

Strip of skin innervated by dorsal and ventral cutaneous nerves from a single spinal nerve

External intercostal membrane; 3

The most medial part of the external intercostal m. that is a semi-transparent membrane (directly superficial to the internal intercostal m.) - Include number in diagram

External intercostal muscle; 4

Muscles lateral to the costochondral joint - Include number in diagram

Elevate ribs and expand the chest cavity (inhilation)

Function of external intercostal m

Genu/symphysis of the mandible

Point of fusion where the 2 halves of the mandible join together during development (midline - near chin)

Gonial angle

Inferior angle of the mandible

Arch of aorta → L subclavian a. → Costocervical trunk → Intercostal a.

Path of intercostal a. from arch of aorta (L side)

Arch of aorta → R brachiocephalic a. → R subclavian a. → Costocervical trunk → Intercostal a.

Path of intercostal a. from arch of aorta (R side)

Ventral rami of 1st 11 thoracic n.

Where do intercostal nerves arise from?

Internal intercostal m.; 5

M. located deep to external intercostal membrane - Include number in diagram

Pull ribs down and in (reducing volume of thoracic cavity)

Function of internal intercostal muscle

Lateral pectoral n.; 3

Supplies innervation to pectoralis major (located medially in pectoralis major) - Include number in diagram

Lateral cord of brachial plexus

What is the lateral pectoral nerve a branch of?

Medial pectoral n.; 4

Supplies innervation to pectoralis major (located laterally - pierces into to pectoralis minor) - Include number in diagram

Branch of medial cord of brachial plexus

What is the medial pectoral n. a branch of?

Pectoralis major; 4

Superficial muscle in thorax (innervated by medial and lateral pectoral nerves) - Include number in diagram

Pectoralis minor; 2

Deep to pectoralis major (innervated by medial pectoral n.) - Include number in diagram

Platysma

Thin muscle embedded in the superficial fascia deep to the skin of the anterior neck (innervated by CN VII)

Sternocostal joint

Joint between manubrium and costal cartilage which joins the anterior ends of the 1st rib

Subcostal n.

Ventral ramus of T12 that lies below the 12th rib

Suprajugular notch

Notch at the superior margin of the manubrium

SS, SS, ANS

Fiber types in ventral rami