Axial Musculature Flashcards
Epicranius
O: Occipital and Temporal Bones
I: Skin of Eyebrows
A: Raises eyebrows, wrinkles forehead
Orbicularis oculi
O: Frontal/Maxillary bone
I: Eyelid tissue
A: Closes eye
Zygomaticus
O: Zygomatic bone
I: Angle of Mouth
A: Raises corner of mouth (smiling)
Depressor anguli oris
O: Body of mandible
I: Angle of mouth
A: Pulls mouth corners down (frowning)
Orbicularis oris
O: Skin/muscle around mouth
I: Skin/muscles at angles of mouth
A: closes lips (Kissing, whistling)
Buccinator
O: maxilla/mandible in molar region
I: Orbicularis oris
A: Compresses cheeks (fish lips!)
Platysma
O: fascia of chest
I: angle of mouth
A: tenses skin of neck
Masseter
O: zygomatic arch
I: angle of mandible
A: elevates mandible
Temporalis
O: temporal bone
I: coronoid process of mandible
A: elevates mandible
Sternocleidomastoid
O: medial portion of clavicle
I: mastoid process
A: flexes/laterally rotates head
Splenius
O: spinous process of c7-t6
I: mastoid process
A: extends/laterally rotates head
Digastric (anterior and posterior bellies)
O: mastoid process
I: hyoid bone
A: elevates hyoid bone
Mylohyoid
O: medial surface of mandible
I: hyoid bone
A: elevates hyoid bone
Sternohyoid
O: manubrium of sternum
I: lower margin of hyoid bone
A: depresses hyoid bone
Omohyoid
O: superior surface of scapula
I: lower margin of hyoid bone
A: depresses/retracts hyoid bone
Erector spinae
O: illium (os coxa)
I: cervical and thoracic vertebrae
A: extends vertebral column
External intercostals
O: inferior border of rib above
I: superior border of rib below
A: elevates rib cage
Internal intercostals
O: superior border of rib below
I: inferior border of rib above
A: depresses rib cage
Diaphragm
O: lumbar vertebrae
I: central tendon of diaphragm
A: expands thoracic cavity
Rectus abdominus
O: pubic crest of os coxa
I: xiphoid process of sternum
A: flexes/rotates lumbar region of vertebral column
External oblique
O: outer surface of ribs 4-12
I: linea alba
A: compresses abdominal wall
Internal oblique
O: iliac crest of os coxa
I: linea alba
A: compresses abdominal wall
Transversus abdominis
O: iliac crest of os coxa
I: linea alba
A: compresses abdominal contents
