MUSCLE ANATOMY EXAM COMPLETE
QUESTIONS AND CORRECT ANSWERS
A+ GRADED!!
1. upper trapezius- ANSWER ✔
-Nerve:accessory nerve (motor)
-Actions: scapula eleavtion
-origin occipital bone, nuchal ligament on upper cervical spinous
processes
-insertion outer third of clavicle, acrominon process
2. trapezius- ANSWER ✔
-Origin spinous processes of vertebrae C1-T12
-Insertion external occipital protuberance, nuchal ligament, medial
superior nuchal line, posterior border of the lateral third of the clavicle,
acromion process, and spine of scapula
-Nerve accessory nerve (motor)
cervical spinal nerves C3 and C4 (motor and sensation)
-Actions rotation, retraction, elevation, and depression of scapula
-Antagonist
,serratus anterior muscle,
Latissimus dorsi
3. levator scapulae- ANSWER ✔
-Origin:Posterior tubercles of transverse processes of C1 - C4 vertebrae
-Insertion:Superior part of medial border of scapula
-Nerve cervical nerve; (C3, C4) and dorsal scapular nerve (C5)
-Actions: Elevates scapula and downward rotation
4. latissimus dorsi- ANSWER ✔
-Origin: Spinous processes of vertebrae T7-L5, thoracolumbar fascia,
iliac crest, inferior 3 or 4 ribs and inferior angle of scapula
-Insertion:Floor of intertubercular groove of the humerus
-Nerve: Thoracodorsal nerve
-Actions: Adducts, extends and internally rotates the arm when the
insertion is moved towards the origin.
-Antagonist: Deltoid and trapezius muscle
,5. pectoralis major- ANSWER ✔
-Origin:
=Clavicular head: anterior border of the medial half of the clavicle.
=Sternocostal head: anterior surface of the sternum, the superior six
costal cartilages, and the aponeurosis of the external oblique muscle
-Insertion: Lateral lip of the bicipital groove of the humerus
(anteromedial proximal humerus)
-Nerve: lateral pectoral nerve and medial pectoral nerve
=Clavicular head: C5 and C6
=Sternocostal head: C7, C8 and T1
-Actions:
=Clavicular head: flexes the humerus
=Sternocostal head: extends the humerus. As a whole, adducts and
medially rotates the humerus. It also draws the scapula anteriorly and
inferiorly.
, 6. pectoralis minor- ANSWER ✔
-Origin; Third to fifth ribs, near their costal cartilages
-Insertion: Medial border and superior surface of the coracoid process of
the scapula
-Nerve: Medial pectoral nerve (C8, T1)
-Actions: Stabilizes the scapula by drawing it inferiorly and
anteriorly against the thoracic wall, raises ribs in inspiration
7. lower trapezius- ANSWER ✔
-O: spinous processes of middle and lower thoracic vertebra
-I:spine medial nagle
-F: depression of scapula
QUESTIONS AND CORRECT ANSWERS
A+ GRADED!!
1. upper trapezius- ANSWER ✔
-Nerve:accessory nerve (motor)
-Actions: scapula eleavtion
-origin occipital bone, nuchal ligament on upper cervical spinous
processes
-insertion outer third of clavicle, acrominon process
2. trapezius- ANSWER ✔
-Origin spinous processes of vertebrae C1-T12
-Insertion external occipital protuberance, nuchal ligament, medial
superior nuchal line, posterior border of the lateral third of the clavicle,
acromion process, and spine of scapula
-Nerve accessory nerve (motor)
cervical spinal nerves C3 and C4 (motor and sensation)
-Actions rotation, retraction, elevation, and depression of scapula
-Antagonist
,serratus anterior muscle,
Latissimus dorsi
3. levator scapulae- ANSWER ✔
-Origin:Posterior tubercles of transverse processes of C1 - C4 vertebrae
-Insertion:Superior part of medial border of scapula
-Nerve cervical nerve; (C3, C4) and dorsal scapular nerve (C5)
-Actions: Elevates scapula and downward rotation
4. latissimus dorsi- ANSWER ✔
-Origin: Spinous processes of vertebrae T7-L5, thoracolumbar fascia,
iliac crest, inferior 3 or 4 ribs and inferior angle of scapula
-Insertion:Floor of intertubercular groove of the humerus
-Nerve: Thoracodorsal nerve
-Actions: Adducts, extends and internally rotates the arm when the
insertion is moved towards the origin.
-Antagonist: Deltoid and trapezius muscle
,5. pectoralis major- ANSWER ✔
-Origin:
=Clavicular head: anterior border of the medial half of the clavicle.
=Sternocostal head: anterior surface of the sternum, the superior six
costal cartilages, and the aponeurosis of the external oblique muscle
-Insertion: Lateral lip of the bicipital groove of the humerus
(anteromedial proximal humerus)
-Nerve: lateral pectoral nerve and medial pectoral nerve
=Clavicular head: C5 and C6
=Sternocostal head: C7, C8 and T1
-Actions:
=Clavicular head: flexes the humerus
=Sternocostal head: extends the humerus. As a whole, adducts and
medially rotates the humerus. It also draws the scapula anteriorly and
inferiorly.
, 6. pectoralis minor- ANSWER ✔
-Origin; Third to fifth ribs, near their costal cartilages
-Insertion: Medial border and superior surface of the coracoid process of
the scapula
-Nerve: Medial pectoral nerve (C8, T1)
-Actions: Stabilizes the scapula by drawing it inferiorly and
anteriorly against the thoracic wall, raises ribs in inspiration
7. lower trapezius- ANSWER ✔
-O: spinous processes of middle and lower thoracic vertebra
-I:spine medial nagle
-F: depression of scapula
