Muscles Of The Head Neck And Trunk Flashcards
Temporalis
O: lateral aspect of the skull in temporal fossa
I: coronoid process of the mandible
A: mandible retraction and elevation at TMJ
Masseter
O: zygomatic arch, zygomatic
I: ramus of mandible and angle of the mandible
A: mandible elevation at TMJ
Medial pterygoid
O: pterygoid process of sphenoid
I: medial surface of mandible
A: mandible protraction, grinding movements at TMJ
Lateral pterygoid
O: pterygoid process, wing of sphenoid
I: mandibular condyle, TMJ
A: mandible protraction and grinding at TMJ
Digastric
O: anterior belly originates on mandible, posterior belly originates on the mastoid of the temporal
I: hyoid
A: hyoid elevation, mandible depression at TMJ
Mylohyoid
O: mandible
I:hyoid
A: hyoid elevation, floor of mouth elevation
Stylohyoid
O: styloid process of temporal (spike)
I: hyoid
A: hyoid elevation and retraction
Sternohyoid
O: sternum
I: hyoid
A: hyoid and larynx depression in swallowing
Omohyoid
O: superior scapula
I: hyoid
A: hyoid depression and retraction
Sternocleidomastoid
O: sternum, clavicle
I: mastoid process of temporal
A: head flexion, lateral flexion at Atlanto-occipital joint and cervical spinal joints
Splenius Capitus
O: upper thoracic vertebrae (spinous processes)
I: temporal and occipital
A: head and neck rotation, lateral flexion, extension at intervertebral joints
Diaphragm
O: inferior rib cage, lumbar vertebrae
I: central tendon in thorax/abdomen
A: moves inferiorly in respiration to increase rib cage volume
External intercostals
Point out, lines form a V
O: superior rib
I: inferior rib
A: rib cage Elevation at costovertebral joints during INhalation
Internal intercostals
Point inward to form upward arrow
O: inferior rib
I: superior rib
A: rib cage depression in forced EXhalation
Pectoralis minor
O: ribs 3-5
I: coracoid process if scapula
A: scapular depression, downward rotation, elevates ribcage at costovertebrals during ihalation
