BIOL 355 Muscle and Bone Action/Origin/Insertion
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20 Terms
Epicranius
action: rasises eyebrows
origin: occipital lobe
insertion: skin of eyebrows
Orbicularis oculi
action: close eyes
origin: maxilla and frontal bones
insertion: circles orbit and inserts near origin
Orbicularis oris
action:
origin:
insertion:
Zygomaticus (major and minor)
action: smiling
origin: zygomatic bone
insertion: angle of mouth
Buccinator
action: compresses cheeks
origin: mandible and maxilla
insertion: angle of mouth
Depressor anguli oris
action: frowning
origin: mandible
insertion: angle of mouth
Depressor labii inferioris
action: depress lower lip
origin: mandible
insertion: lower lip
Levator labii superioris
action: elevate upper lip
origin: maxilla and zygomatic
insertion: upper lip
Risorius
action: smiling
origin: masseter
insertion: angle of mouth
Masseter
action: elevate the mandible (closes mouth)
origin: zygomatic arch
insertion: mandibular ramus
Temporalis
action: elevate the mandible (closes mouth)
origin: temporal fossa
insertion: coronoid process
Erector spinae
action: extend the torso (vertebral column)
origin: pelvis, ribs, vertebrae
insertion: ribs, vertebrae, mastoid process, temporal bone
Quadratus lumborum
action: extend the torso (both), or lateral flexion (one)
origin: pelvis
insertion: lumbar vertebrae, ribs
External intercostals
action: expand the ribcage (for inhalation)
origin: rib
insertion: rib
Internal intercostals
action: compresses the ribcage (for exhalation)
origin: rib
insertion: rib
Diaphragm
action: inhalation
origin: rib cage, sternum, and vertebrae (all structures that make up the thoracic wall)
insertion: a tendon running through middle of thoracic wall
Rectus abdominus
action: flex the torso
origin: pelvis
insertion: xyphoid process of the sternum, ribs
External oblique
action: rotate the torso and compress the abdomen
origin: ribs
insertion: mostly to the linea alba
Internal oblique
action: rotate the torso and compress the abdomen
origin: pelvis
insertion: mostly to the linea alba
Transversus abdominus
action: rotate the torso and compress the abdomen
origin: ribs and pelvis
insertion: mostly to the linea alba