Anatomy Lecture 13

Region of body between Neck and Abdomen

□ Anterior - sternum, ribs
□ Lateral - Ribs
□ Posterior - 12 Thoracic vertebrae
□ Inferior - Diaphragm

□ Protective of thoracic and part of the abdominal viscera (the organs inside the abdominal cavity)
□ Respiration
□ Supportive of the upper limb

1) Posterior Intercostal aa.
2) Anterior Intercostal aa.
□ Internal Thoracic aa. (aka Subclavian aa.)

1) Anterior Intercostal vv.
2) Posterior Intercostal vv. - empties into the Azygous vv.
3) Azygos vv. - empties into the superior Vena Cava

□ Intercostal nn. (aka Thoracic Spinal nn.) - these are the simplest spinal nn.

the lungs

is the midline between the two lungs.
- The central compartment of the thoracic cavity.
- Heart, trachea, esophagus, Vagus nn., Thymus, Sympathetic Trunk, Aorta, Azygos

- Left - 2 lobes
-Right - 3 lobes
- lobes are separate and can be removed

- airway from nose and mouth to thorax.
- Divides into 2 bronchi
- Bronchi divide into Lobar Bronchi
– Lobar Bronchi divide into segmental bronchi

the Serous Membrane in the Thorax.
- reduces friction btwn organs.

...is the side of the "balloon" attached to inner side of Thoracic cage

...is the side attached to the lung

...is the result of air getting into the Pleura.

- Create a Vacuum in the Lungs by enlarging the Thoracic Cage in a:
- Transverse direction by movement of the ribs (Ribs are elevated by mm.)
- Anterior-Posterior direction
- Superior-Inferior direction by the Respiratory Diaphragm.

Diaphragm contracting builds up pressure to expel air by increasing the size of the thoracic cavity Superior to Inferior

INN: Phrenic nn. from C4, C5, C6.