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
Scalenes
O: cervical vertebrae
I: first two ribs
A: elevates ribs during inhalation
Rectus abdominus
O: pubis
I: xiphoid process, ribs 5-7
A: trunk flexion at intervertebral joints
External obliques
O: lower 8 ribs
I: iliac crest, pubis (aponeurosis into linea alba)
A: compress abdominal cavity, trunk flexion, rotation at intervertebrals
Internal obliques
O: anterior iliac crest
I: linea alba, lower ribs
A: compress abdominal cavity, trunk flexion and rotation at intervertebrals
Transversus abdominus
O: lower 6 ribs, iliac crest
I: aponeurosis into linea alba
A: compress abdominal cavity
Serratus anterior
O: ribs 1-8 on anterolateral thoracic wall
I: medial border of scapula (inferior angle)
A: scapula protraction, upward rotation of glenoid cavity (?), holds scapula against thoracic wall during push and punch
Trapezius
O: occipital, vertebrae (spinous process)
I: spine and acromion of scapula, clavicle
A: scapular retraction, scapular elevation, depression at physiological scapulothoracic joint, when scap fixed extends head at intervertebrals
Levator scapulae
O: transverse processes of cervical vertebrae
I: superior angle of scapula, medial border of scapula
A: scapula elevation at physiological scapulothoracic joint
Rhomboideus major
O: spinous process of T2 to T5 vertebrae
I: medial border of scapula
A: scapula elevation, retraction, downward rotation if glenoid cavity at PS joint
Rhomboideus minor
O: spinous process of C7-T1
I: medial border if the scapula
A: scapula elevation, retraction, downtown rotation of glenoid cavity at PS joint
Erector spinae
O:
Quadratus lumborum
O: iliac crest
I: last rib and lumbar vertebrae
A: trunk lateral flexion, lumbar trunk extension at intervertebrals