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Respiratory Muscles > External Structures of the Thoracic Cavity > Flashcards

External Structures of the Thoracic Cavity Flashcards

1
Q

FRONT MUSCLES OF CHEST WALL AND SHOULDER:
Pectoralis Major

A

Origin: costal cartilage; clavicle
Insertion: Greater tubercle of humerus
Innervation: Brachial Plexus
Function: elevates sternum; pulls rib up during forced inspiration

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2
Q

FRONT MUSCLES OF CHEST WALL AND SHOULDER:
Pectoralis Minor

A

Origin: ribs 2-5
Insertion: coracoid process of scapula
Innervation: Brachial plexus
Function: increase transverse dimension of ribs 3-5

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3
Q

FRONT MUSCLES OF CHEST WALL AND SHOULDER:
Serratus Anterior

A

Origin: First 8 or 9 upper ribs
Insertion: Scapula
Innervation: C5-C7
Function: Elevates ribs 1-9

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4
Q

FRONT MUSCLES OF CHEST WALL AND SHOULDER
Subclavius

A

Origin: Clavicle
Insertion: 1st rib
Innervation: C5-C6
Function: Elevates 1st rib

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5
Q

THORAX
Internal Intercostals: Intercartilaginous Portion

A

Origin: lower border chondral portion of ribs 2-12
Insertion: Inner aspect of the chondral portion of ribs
Innervation: Intercostal nerves
Function: Move sternocostal region up

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6
Q

THORAX
Internal Intercostals:
Interosserous Portion

A

Origin: Inferior borders of ribs 1-11
Insertion: Superior borders of ribs 1-11
Innervation: Intercostal nerves
Function: Depresses ribs

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7
Q

THORAX
Internal Intercostals:
External Intercostal

A

Origin: Dorsal surface of ribs 1-11
Insertion: Ventral aspect below rib
Innervation: Intercostal nerves
Function: Elevates all ribs

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8
Q

ABDOMEN
Transverse Abdominis

A

Origin: Posterior abdominal wall @ vertebral column
Insertion: ribs 6-12; pubis
Innervation: T7-T12; L1
Function: Compresses abdomen

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9
Q

ABDOMEN
External Abdominal Oblique

A

Origin: lower 7 ribs
Insertion: iliac crest, inguinal ligament, abdominal aponeurosis
Innervation: T7-T12
Function: Flexes vertebral column, compresses abdomen, trunk rotation

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10
Q

ABDOMEN
Internal Abdominal Oblique

A

Origin: inguinal ligament, iliac crest
Insertion: Lower ribs, abdominal aponeurosis
Innervation: T7-T12, L1
Function: rotates/flexes trunk, compresses abdomen

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11
Q

ABDOMEN
Rectus Abdominis

A

Origin: Pubis inferiorly
Insertion: Xiphoid, ribs 5-7
Innervation: T5-T12
Function: flexion of vertebral column

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12
Q

NECK
Sternocleidomastoid

A

Origin: mastoid process
Insertion: superior manubrium; clavicle
Innervation: CN XI; arise C2-C5
Function: Head turn (unilateral), elevates sternum and anterior ribs

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13
Q

NECK
Scalene (ant/mid/post)

A

Origin: Transverse process C3-C6; C2-C7; C5-C7
Insertion: ant/mid: Superior rib 1, post: C3-C6
Innervation: ant/mid: C3-C8, post: C3-C6
Function: Stabilizes head, facilitates rotation, elevates rib 1 or 2

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14
Q

BACK
Rhomboideus Major

A

Origin: Spinal Process T2-T5
Insertion: Scapula
Innervation: C5 and C5
Function: Stabilizes shoulder girdle

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15
Q

BACK
Rhomboideus Minor

A

Origin: Spinal Process C7-T1
Insertion: Scapula
Innervation: C4 and C5
Function: Stabilize shoulder girdle

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16
Q

BACK
Trapezius

A

Origin: Spinous process C2-T12
Insertion: Scapula, clavicle
Innervation: CN XI; C3 and C4
Function: Stabilizes shoulder girdle

17
Q

BACK
Quadratus Lumborum

A

Origin: Iliac crest
Insertion: Lumbar vertebrae; rib 12
Innervation: T12; L1-L4
Function: Fixes abdominal wall

18
Q

BACK
Latissimus Dorsi

A

Origin: iliac crest, lumbar, sacral, and thoracic vertebrae
Insertion: humerus
Innervation: C6-C8
Function: Stabilizes posterior abdominal wall for expiration

19
Q

BACK
Serratus Posterior Superior

A

Origin: Spinous Processes C7, T1-T3
Insertion: ribs 2-5
Innervation: Spinal nerves T1-T4 or T5
Function: elevate ribs 2-5

20
Q

BACK
Serratus Posterior Inferior

A

Origin: inner posterior thorax
Insertion: Inner surface 2nd and 3rd rib below
Innervation: Intercostal nerves T9-T12
Function: pull rib cage down

21
Q

BACK
Levator Costarum Brevis/Longus

A

Origin: Transverse process
Insertion: Brevis: tubercle of rib below; Longus: every other rib
Innervation: INtercostal nerves
Function: elevate ribs

22
Q

BACK
Levator Scapulae

A

Origin: transverse process of C1-C4
Insertion: Medial border of scapula
Innervation: Dorsal scapular nerve
Function: elevates scapula

23
Q

BACK
Erector Spinae

A

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