Final: Lecture 13

Question 0

Latissimus dorsi

Answer 0

• Proximal: spinous processes of inferior 6 thoracic T6-T12, thoracolumbar fascia, iliac crest, and inferior 3 ribs
• Distal: floor of intertubercular sulcus (bicipital groove) of humerus
• Actions: extends, adducts, and medially rotates humerus, raises torso towards arms during climbing
• Innervation: thoracodorsal nerve

Question 1

Trapezius (proximal attachment, distal attachment, actions, innervation)

Answer 1

• Proximal attachment: External occipital protuberance of skull, nuchal ligament, spinous processes of C7-T12
• Distal: lateral third of clavicle (anterior), acromion, and spine of scapula
• Actions: elevates, depresses, and retracts scapula, rotates gleniod fossa superiorly
• Innervation: Motor-accessory nerve

Question 2

Rhomboid major

Answer 2

• Proximal: spinous processes of T2-T5
• Distal: medial border of scapula from level of spine to inferior angle
• Actions: retract elevate, and rotate scapula downward, as well as fix it to thoracic wall
• Innervation: dorsal scapular nerve

Question 3

Rhomboid minor

Answer 3

• PA: nuchal ligament, spinous processess of C7 and T1
• DA: medial end of scapular spine
• Actions: retract, elevate, and rotate scapula downward, as well as fix it to thoracic wall
• Innervation: dorsal scapular nerve

Question 4

Levator scapulae

Answer 4

• PA: posterior tubercles of transverse processes of first 4 cervical vertebrae
• DA: medial border of scapula, superior part of scapular spine
• Actions: elevates scapula and tilts glenoid fossa inferiorly by rotating scapula (downward rotation)
• Innervations: dorsal scapular nerve and ventral rami of cervical spinal nerves