PNB 2274 Muscles of the Axial Skeleton
Origin Point 2 of the Lateral Pterygoid
Lateral pterygoid plate of Shenoid
Trapezius Muscle
elevates, depresses, and retracts the scapula; when both sides act together it draws the head backwards (dorsally)
Pectoralis Major Muscle
flexion, adduction and medial rotation of shoulder (about the humerus)
Insertion Point of the Pectoralis Major
greater tubercle of humerus
Insertion Point of the Digastricus
hyoid bone
Insertion Point of the Latissimus Dorsi
intertubercular groove of humerus
Origin Point 2 of the Masseter
zygomatic arch
Temporalis Muscle
closes the jaw by elevating the mandible
Insertion Point of the Lateral Pterygoid
condyloid process of Mandible
Origin Point 1 of the Masseter
maxilla
Origin Point 2 of the Trapezius
occipital bone of skull
Lateral Pterygoid Muscle
opening the jaw by lowering the mandible and allowing yawning when both sides of the muscle work together
Digastricus Muscle
opens mouth by lowering the mandible, and also elevates and holds hyoid during speech and swallowing
Insertion Point 1 of the Trapezius
posterior portion of the clavicle
Sternocleidomastoid Muscle
rotates/tilts head to the opposite side and flexes the neck/extends the head when the muscles on both sides work together
Insertion Point 3 of the Trapezius
spine of scapula
Origin Point 1 the Trapezius
spinous process of C7 and all thoracic vertebrae
Origin Points of the Latissimus Dorsi
spinous processes of thoracic and lumbar vertebrae, sacrum and iliac crest
Origin Points of the Pectoralis Major
sternum, clavicle, costal cartilage of 1-6 ribs
Origin Point 1 of the Lateral Pterygoid
Greater wing of Sphenoid
Medial Pterygoid Muscle
closes jaw and lateral excursion
Insertion Point of the Medial Pterygoid
Ramus of the Mandible
Masseter Muscle
closes the jaw by elevating and retracting the mandible
Insertion Point 2 of the Trapezius
acromion process
Latissimus Dorsi Muscle
adducts and extends shoulder; rotates shoulder, draws shoulder down and backward
Origin Point of the Medial Pterygoid
lateral pterygoid plate of sphenoid
Origin Point 1 of the Digastricus
lower mandible (chin)
Origin Point 1 of the Sternocleidomastoid
manabrium of sternum
Insertion Point of the Masseter
mandible
Insertion Point of the Temporalis
mandible (coronoid process)
Origin Point 2 of the Digastricus
mastoid process of skull
Insertion Point of the Sternocleidomastoid
mastoid process of the skull
Origin Point of the Temporalis
temporal bone
Origin Point 2 of the Sternocleidomastoid
the main Origin Point is the clavical (medial portion)
