Muscle Facts Exam 1 Flashcards by Paige Tucker

Origin of the clavicular head of the pectoralis major

Anterior surface of the clavicle

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Origin of the sternocostal head of the pectoralis major

Anterior surface of the sternum, superior six costal cartilages, external oblique muscle

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Insertion of the pectoralis major

Intertubercular sulcus of the humerus

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Innervation of the pectoralis major

Lateral and medial pectoral nerves

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Action(s) of the pectoralis major

Adducts and medially rotates the humerus, draws scapula anteriorly and inferiorly

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Blood supply of the pectoralis major muscle

Thoracoacromial artery, pectoral vein

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Origin of the pectoralis minor

3rd-5th ribs near their costal cartilages

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Insertion of the pectoralis minor

Coracoid process of the scapula

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Innervation of the pectoralis minor

Medial pectoral nerve

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Blood supply of the pectoralis minor

Pectoral branches of the thoracoacromial artery, pectoral vein

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Action of the pectorals minor

stabilizes scapula by drawing it inferiorly and anteriorly against thoracic wall

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Origin of subclavius

junction of 1st rib and its costal cartilage

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Insertion of subclavius

inferior surface of clavicle

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Innervation of subclavius

subclavian nerve

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Action of subclavius

anchors and depresses clavicle

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Blood supply of subclavius

clavicular branch of thoracoacromial artery, subclavian artery and vein

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Origin of serratus anterior

lateral parts of ribs 1-8

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Insertion of serratus anterior

medial border of scapula

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Innervation of serratus anterior

long thoracic nerve

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Action of serratus anterior

protracts scapula and holds against thoracic wall, rotates scapula

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Blood supply of serratus anterior

lateral thoracic artery and vein

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Origin of external intercostals

inferior border of ribs

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Insertion of external intercostals

superior border of ribs below

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Innervation of external intercostals

intercostal nerve

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Action of external intercostals

elevates ribs (during forced inspiration)

Blood supply of external intercostals

anterior and posterior intercostal artery and vein

Origin of internal intercostals

inferior border of ribs

Insertion of internal intercostals

superior border of ribs below

Innervation of internal intercostals

intercostal nerve

Action of internal intercostals

interosseous part depresses ribs, interchondral part elevates ribs (during forced respiration

Blood supply of internal intercostals

anterior and posterior intercostal artery and vein

Origin of innermost intercostals

inferior border of ribs

Insertion of innermost intercostals

Superior border of ribs below

Innervation of innermost intercostals

Intercostal nerve

Action of innermost intercostals

Interosseous part depresses ribs and interchondral part elevates ribs (during forced respiration)

Blood supply of innermost intercostals

Anterior and posterior intercostal artery and vein

Origin of diaphragm

Xiphoid process, lower 6 costal cartilages, L1-L3 vertebrae

Insertion of diaphragm

Central tendon

Action of diaphragm

Most important muscle of respiration, abdominal straining and weight lifting

Innervation of diaphragm

Phrenic nerve

Blood supply of diaphragm

Phrenic artery and vein

Origin of transversus thoracis

Posterior surface of lower sternum

Insertion of transversus thoracis

Internal surface of costal cartilages 2-6

Innervation of transversus thoracis

Intercostal nerve

Action of transversus thoracis

Weakly depresses ribs

Blood supply of transversus thoracis

Internal thoracic artery and vein

Origin of rectus abdominis

Pubic symphysis and crest

Insertion of rectus abdominis

Xiphoid process, 5th-7th costal cartilages

Innervation of rectus abdominis

Thoracoabdominal and subcostal nerves

Action of rectus abdominis

Flexes trunk, compresses abdominal viscera, stabilizes and controls tilt of pelvis

Blood supply of rectus abdominis

Superior and inferior epigastric artery and vein

Origin of external oblique

External surface of ribs 5-12

Insertion of external oblique

Linea alba, pubic tubercle, anterior half of iliac crest

Innervation of external oblique

Thoracoabdominal and subcostal nerve

Action of external oblique

Compress and support abdominal viscera, flex and rotate trunk

Blood supply of external oblique

Superior and inferior epigastric artery and vein, lumbar artery and vein

Origin of internal oblique

Thoracolumbar fascia, iliac crest, connective tissue deep to inguinal ligament

Insertion of internal oblique

Inferior border of ribs 10-12, linea alba, pubis via conjoint tendon

Innervation of internal oblique

Thoracoabdominal, subcostal, and first lumbar nerve

Action of internal oblique

Compress and support abdominal viscera, flex and rotate trunk

Blood supply of internal oblique

Superior and inferior epigastric artery and vein, lumbar artery and vein

Origin of transversus abdominis

Internal surface of 7-12 costal cartilages, thoracolumbar fascia, iliac crest, connective tissue deep to inguinal ligament

Insertion of transversus abdominis

Linea alba with aponeurosis of internal oblique, pubic crest, pubis via conjoint tendon

Innervation of transversus abdominis

Thoracoabdominal, subcostal, and first lumbar nerves

Action of transversus abdominis

Compresses and supports abdominal viscera

Blood supply of transversus abdominis

Superior and inferior epigastric artery and vein, lumbar artery and vein

Origin of psoas

Transverse process of lumbar vertebrae, sides of body of T12-L5 vertebrae, intervertebral discs

Insertion of psoas

Strong tendon to a lesser trochanter of femur

Innervation of psoas

Lumbar plexus

Action of psoas

Flexes thigh (with iliacus), flexes vertebral column laterally to balance trunk, flexes trunk when sitting (with iliacus)

Blood supply of psoas

Lumbar artery and vein

Origin of quadratus lumborum

Inferior border of 12 rib and lumbar transverse process

Insertion of quadratus lumborum

Iliolumbar ligament and internal lip of iliac crest

Innervation of quadratus lumborum

Anterior branches of T12 and L1-L4 nerves

Action of quadratus lumborum

Extend and laterally flexes vertebral column, fixes 12th rib during inspiration

Blood supply of quadratus lumborum

Lumbar artery and vein

Origin of iliacus

Iliac fossa, ala of sacrum, anterior sacroiliac ligaments

Insertion of iliacus

Lesser trochanter of femur, psoas major tendon

Innervation of iliacus

Femoral nerve

Action of iliacus

Flexes thigh, stabilizes hip joint

Blood supply of iliacus

Lumbar artery and vein