Muscles of the Head, Neck, and Trunk Flashcards
Origin, Insertion, and Action of the Temporalis
O:Lateral aspect of the skull (temporal fossa)
I:Coronoid process of mandible
A:Mandible retraction, elevation @ temporomandibular joint
Origin, Insertion, and Action of the Masseter
O:Zygomatic arch, Zygomatic
I:Angle/Ramus of mandible
A:Mandible elevation @ temporomandibular joint
Origin, Insertion, and Action of the Medial Pterygoid (not on cadaver)
O:Pterygoid process of sphenoid bone
I:Medial surface of mandible
A:Mandible protraction (protrusion), grinding movements @ temporomadibular joint
Origin, Insertion, and Action of the Lateral Pterygoid
O:Pterygoid prcess, greater wing of sphenoid bone
I:Mandibular condyle, TMJ
A:Mandible protraction (protrusion), grinding movements @ temporonandibular joint
Origin, Insertion, and Action of the Digastric
O:Mandible (anterior belly), Mastoid (posterior belly)
I:Hyoid
A:Hyoid elevstion, mandible depression @ temporomandibular joint
Origin, Insertion, and Action of the Mylohyid
O:Medial mandible
I:Hyoid
A:hyoid elevation, floor of mouth elevation (swallowing)
Origin, Insertion, and Action of the Stylohyoid
O:Styloid process of temporal
I:Hyoid
A:Hyoid elevation, retraction
Origin, Insertion, and Action of the Sternohyoid
O:Sternum
I:Hyoid
A:Hyoid, larynx depression (swallowing)
Origin, Insertion, and Action of the Omohyoid
O:Superior scapula
I:Hyoid
A:Hyoid Depression, retraction
Origin, Insertion, and Action of the Sternocleidomastoid
O:Sternum, clavicle
I:Mastoid process of temporal
A:Head flexion, lateral flexion @ atlantooccipital joint & cervicle spinal joints
Origin, Insertion, and Action of the Splenius capitis
O:Ligamentum nuchae Spinous process of C7-T6
I:Mastoid process of temporal, Occipital bone of skull
A:Head & neck rotation, lateral flexion extension @ intervertebral joints
Origin, Insertion, and Action of the Diaphragm
O:Inderior rib cage, lumbar vertebrae
I:Central tendon in thorax/abdomen
A:Moves inferiorly during inspiration to increase rib cage volume
Origin, Insertion, and Action of the External intercostal
O:Superior rib
I:inferior rib
A:Rib cage elevation [@costovertebral joints during inspiration]
Origin, Insertion, and Action of the Internal intercostal
O:Inferior Rib
I:Superior Rib
A:Rib cage depression [@costovertebral
joints during forced exhalation]
Origin, Insertion, and Action of the Pectoralis minor
O:Ribs 3-5
I:Coracoid process of scapula
A:Scapular depression downward rotation; if scapula fixed, elevates ribcage [@costovertebral joints during forced inspiration]
Origin, Insertion, and Action of the Serratus anterior
O:ribs 1-8 on anterolateral thoracic wall
I:Medial border of scapula (heaviest insertion at inferior angle)
A:Scapula protraction upward rotation of glenoid caviy @ physiological scapulothoracic joint; Holds scapula against thoracic wall during push, punch
Origin, Insertion, and Action of the Rectus Abdominis
O:Pubic crest, symphysis
I:Xiphoid process ribs 5-7
A:Trunk flexion @ intervertebral joints
Origin, Insertion, and Action of the External Oblique
O:Lower 8 ribs
I:Iliac crest, Pubis, Aponeurosis into linea alba
A:Compress abdominal cavity, Trunk flexion, rotation @ intervebral joints
Origin, Insertion, and Action of the Internal Oblique
O:Anterior iliac crest, Thoracolumbar fascia
I:Linea alba, lower ribs
A:Compress abdominal cavity, Trunk Flexion, rotation @ intervertebral joints
Origin, Insertion, and Action of the Transverse abdominis
O:Thoracolumbar fascia, Lower 6 ribs, Iliac crest
I:Aponeurosis into linea alba
A:Compress abdominal cavity
