Muscles from Axial skeleton to Pectoral girdle and Humerus

Question 1

State the Origin, Insertion, Nerve supply, movements and position of Pectoralis Major

Answer 1

Origin: Sternocostal Head and Clavicular Head
Insertion: Lateral part of the intertubercular groove
Nerve Supply: Lateral and Medial Pectoral Nerve
Movement: Adducts humerus, internally rotate humerus, help protract scapula by pulling on the humerus
Position: Anterior

Question 2

State the Origin, Insertion, Nerve supply, movements and position of the Subclavius muscle

Answer 2

Origin: Costal cartilage of the 1st rib
Insertion: Clavicle
Nerve Supply: C5 nerve
Movement: Weak depressor of scapula, "braces" clavicle
Position: Anterior

Question 3

State the Origin, Insertion, Nerve supply, movements and position of Pectoralis Minor

Answer 3

Origin: 3rd to 5th rib
Insertion: Coracoid process of scapula
Nerve Supply: Medial Pectoral Nerve
Movement: Depresses and protracts scapula
Position: Anterior

Question 4

State the Origin, Insertion, Nerve supply, movements and position of Serratus Anterior

Answer 4

Origin: Ribs 1-8/9
Insertion: Medial border of scapula
Nerve Supply: Long thoracic nerve
Movement: Protracts scapula, lower fibres help superiorly rotate scapula
Position: Anterior

Question 5

State the Origin, Insertion, Nerve supply, movements and position of Trapezius

Answer 5

Split into Superior, Middle and Inferior muscles.

Origin: From the External occipital protuberance to the spinous process of the thoracic vertebrae
Insertion: Anatomical Horseshoe/Acromion
Nerve Supply: Cranial nerve XI (11)
Movement:
Sup only - elevates scapula
Mid only - retracts scapula
Inf only - depress scapula
Sup + Inf - superior rotation of scapula
All - retract scapula
Position: Posterior

Question 6

State the Origin, Insertion, Nerve supply, movements and position of Levator Scapulae

Answer 6

Origin: Transverse process of the upper cervical vertebrae
Insertion: Superior angle of the scapula
Nerve Supply: Dorsal scapular nerve
Movement: elevates scapula, helps inferiorly rotate scapula
Position: Posterior

Question 7

State the Origin, Insertion, Nerve supply, movements and position of the Rhomboid Major and Minor

Answer 7

Origin:
RMaj - Spinous process of the T2 vertebrae to T5 vertebrae
RMin - Spinous process of the T1 vertebrae to T2 vertebrae
Insertion:
Both - Medial border of the scapula
Nerve Supply:
Both - Dorsal Scapular nerve
Movements:
Both: Retract scapula, inferiorly rotate scapula, elevate scapula
Position:
Both - Posterior

Question 8

State the Origin, Insertion, Nerve supply, movements and position of the Latissimus Dorsi

Answer 8

Origin: Spinous process of the thoracic-lumbar vertebra to the sacrum
Insertion: Floor of the intertubercular groove
Nerve Supply: Thoracodorsal nerve
Movement: Adducts humerus, Internally rotate the humerus, lower fibres can help depress scapula by pulling on humerus, inferiorly rotate scapula by pulling on humerus