Anatomy Quiz 2 Flashcards
Thoracic
Serratus Posterior Superior
O: Nuchal ligament, spinous processes of C7-T3
I: Ribs 2-5
Inn: Anterior rami of upper thoracic nerve
A: elevate ribs (proprioception)
Serratus Posterior Inferior
O: Spinous processes of T11-L2 vertebra
I: inferior border of 9-12 ribs
Inn: anterior rami (upper thoracic nerve) to T9-T12 thoracic spinal nerve
A: depress ribs during expiration
Levator Costarum
O: transverse processes of C7-T11
I: subjacent ribs between tubercle and angle
Inn: posterior rami of C8-T11
A: elevate ribs
External Intercostal
O: inferior border of ribs
I: superior border of ribs below
Inn: Intercostal nerve
A: elevates ribs during forced inspiration
Internal Intercostal
O: inferior border of ribs
I: superior border of ribs below
Inn: intercostal nerve
A: Interosseous (between bones) part: depresses ribs
Interchondral (between cartilage) part: elevates ribs
Innermost Intercostal
O: inferior border of ribs
I: superior border of ribs below
Inn: intercostal nerve
A: Interosseous (between bones) part: depresses ribs
Interchondral (between cartilage) part: elevates ribs
(not confirmed)
Subcostal
O: internal surface of lower ribs near their angles
I: superior borders of 2-3 ribs below
Inn: intercostal nerve
A: act in same manner as intercostal muscles (depress ribs)
Transversus Thoracis
O: posterior surface of lower sternum
I: internal surface of costal cartilages 2-6
Inn: intercostal nerves
A: weakly depress ribs
Pectoralis Major (Clavicular)
O: clavicle (medial half)
I: humerus (crest of greater tuberosity)
Inn: medial and lateral pectoral nerve (C5-T1)
A: flexion, assist in respiration when shoulder is fixed, adduction, and internal rotation
Pectoralis Major (Sternocostal)
O: sternum and costal cartilages 1-6
I: humerus (crest of greater tuberosity)
Inn: medial and lateral pectoral nerve (C5-T1)
A: flexion, assist in respiration when shoulder is fixed, adduction, and internal rotation
Pectoralis Major (Abdominal)
O: rectus sheath (anterior layer)
I: humerus (crest of greater tuberosity)
Inn: medial and lateral pectoral nerve (C5-T1)
A: adduction and internal rotation of humerus
Pectoralis Minor
O: 3-5 ribs near costal cartilages
I: medial border and superior surface of coracoid process of scapula
Inn: medial and lateral pectoral nerve
A: stabilizes scapula by drawing in inferiorly and anteriorly against thoracic wall
Subclavius
O: junction of 1st rib and costal cartilage
I: inferior surface of middle third clavicle
Inn: nerve to subclavius?
A: anchors and depresses clavicle
Serratus Anterior
O: external surface of lateral part of 1-8 ribs
I: anterior surface of medial border of scapula, including superior and inferior angles
Inn: long thoracic nerve
A: protracts scapula and holds it against thoracic wall, rotates scapula
Posterior Scalene
O: Posterior tubercles of transverse processes of C4-C6
I: upper surface of rib 2
Inn: Anterior Rami C5-C7
A: Elevation of rib 2
