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Anatomy > Thoracic Wall > Flashcards

Thoracic Wall Flashcards

1
Q

Diaphragm Innervation

A

Phrenic nerve; most peripheral sections via intercostal nerves

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2
Q

Diaphragm Function

A

Depresses to enable inspiration (inhaling air)

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3
Q

External intercostal muscles innervation

A

Intercostal nerves

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4
Q

External intercostal muscles function

A

Elevates ribs to aid forced inspiration

Fibers run posterior to anterior

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5
Q

Pleural Sac Distribution

A

Surrounds lungs. Transitions between parietal and visceral layer occurs at the hilum of the lung.

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5
Q

Internal intercostal muscles Innervation

A

Intercostal nerves

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6
Q

Internal intercostal muscles functions

A

Depresses ribs to aid forced expiration

Fibers run anterior to posterior

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7
Q

Posterior intercostal arteries “arises from/drains

A

Descending thoracic aorta

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8
Q

Posterior intercostal arteries “Enters/Drains Into”

A

Thoracic wall

Anastomoses with anterior intercostal arteries

Lies on underside of each rib

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9
Q

Posterior intercostal veins (Arises from/drains)

A

Azygos vein (right side); Hemiazygos vein or accessory hemiazygos vein (left side of chest)

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9
Q

Internal thoracic artery “arises from/drains

A

Subclavian artery

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10
Q

Internal thoracic artery “Enters/drains into”

A

Anterior intercostal arteries
superior epigastric artery

Harvested for coronary artery bypass grafts

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11
Q

Intercostal Nerve Innervates

A

Skin and muscles of thoracic and abdominal wall

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11
Q

Phrenic Innervates

A

Parietal pleura along mediastinum and diaphragm, fibrous/parietal pericardial sac, diaphragm

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12
Q

Intercostal nerves

A

Spinal cord levels: T1-T11 (T12 is subcostal)
Source: Thoracis ventral rami
Destination: Thoracic and abdominal wall

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13
Q

Phrenic Nerve

A

Spinal cord levels: C3-C5
Source: Cervical plexus (ventral rami of cervical spinal nerves)
Destination: Diaphragm

14
Q

Sternum

A

Sternal angle between manubrium/body is level with great vessels when standing

15
Q

Manubrium

A

Top part of the sternum

16
Q

Jugular notch of manubrium

A

Helpful for feeling aortic pulse in pathologic conditions

17
Q

Sternal angle

A

Contact between manubrium and body-useful landmark for great vessels

18
Q

Body of sternum

A

Connection between manubrium & body = sternal angle

19
Q

Xiphoid process

A

Little bony part at the bottom of the sternum

20
Q

Ribs

A

12 pair
7 true, 5 false (incl. 2 floating)

21
Q

Head of ribs

A

Contains facets articulating to bodies of thoracic vertebrae

22
Q

Tubercle of ribs

A

Contains facets articulating to transverse processes of thoracic vertebrae

23
Q

Costal groove

A

Groove on inferior ribs containing costal nerves and vessels

24
Q

Costal cartilage

A

Cartilage connecting ribs to sternum

24
Q

Thoracic Vertebrae

A

T1-T12. Has attachments for ribs

Anatomy (25 decks)

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