| Muscle |
All |
Action |
Origin |
Insertion |
| Frontalis
(occipitofrontalis) |
-[A]- Raises eyebrows, wrinkles forehead (F only)
-[O]- Galea aponeurotica (both)
-[I]- skin above eyebrows (F only) |
-[A]- Raises eyebrows, wrinkles forehead (F only) |
-[O]- Galea aponeurotica (both) |
-[I]- skin above eyebrows (F only) |
| Occipitalis
(occipitofrontalis) |
-[A]- Anchors & retracts galea posteriorly (O only)
-[O]- Galea aponeurotica (both)
-[I]- Superior nuchal line of occiput (O only) |
-[A]- Anchors & retracts galea posteriorly (O only) |
-[O]- Galea aponeurotica (both) |
-[I]- Superior nuchal line of occiput (O only) |
| Temporalis |
-[A]- Elevates & retracts mandible
-[O]- Temporal fossa & fascia
-[I]- Mandible: Coronoid process |
-[A]- Elevates & retracts mandible |
-[O]- Temporal fossa & fascia |
-[I]- Mandible: Coronoid process |
| Masseter |
-[A]- Elevates mandible.
UniL: moves jaw laterally to same side.
-[O]- Zygomatic arch
-[I]- Angle & ramus of mandible
|
-[A]- Elevates mandible
UniL: moves jaw laterally to same side.
|
-[O]- Zygomatic arch |
-[I]- Angle & ramus of mandible |
| Sternocleidomastoid |
-[A]- UniL: Laterally flexes head to same side
Rotates head to opp. side
BiL: Flexes neck
Assists inhalation
-[O]- Sternal Head: top of manubrium
Clavicular Head: Medial 1/3 of clavicle
-[I]- Temporal: Mastiod process;
lateral superior nuchal |
-[A]-UniL: Laterally flexes head to same side. Rotates head to opp. side.
BiL: Flexes neck. Assists inhalation. |
-[O]- Sternal Head: top of manubrium.
Clavicular Head: Medial 1/3 of clavicle. |
-[I]- Mastiod process of temporal bone;
lateral superior nuchal line of occiput |
| Scalenes (anterior) |
-[A]- BiL: Elevate ribs during inhalation.
Flex neck (ant scalene only)
UniL: w/fixed ribs, laterally flex neck to same side. Rotate head & neck to opp. side
-[O]- Trans Process C-3 to C-6 (ant. tubercles)
-[I]- 1st rib |
-[A]- BiL: Elevate ribs during inhalation.
Flex neck (ant. scalene only)
UniL: w/fixed ribs, laterally flex neck to same side. Rotate head & neck to opp. side |
-[O]- Trans Process C-3 to C-6 (ant. tubercles) |
-[I]- 1st rib |
| Scalenes (medius) |
-[A]- BiL: Elevate ribs during inhalation.
UniL: w/fixed ribs, laterally flex neck to same side. Rotate head & neck to opp. side.
-[O]- Trans Process C-2 to C-7 (post. tubercles)
-[I]- 1st rib
|
-[A]- BiL: Elevate ribs during inhalation.
UniL: w/fixed ribs, laterally flex neck to same side. Rotate head & neck to opp. side. |
-[O]- Trans Process C-2 to C-7 (post. tubercles) |
-[I]- 1st rib |
| Scalenes (posterior) |
-[A]- BiL: Elevate ribs during inhalation.
UniL: w/fixed ribs, laterally flex neck to same side. Rotate head & neck to opp. side.
-[O]- Trans Process C-5 & C-6 (post. tubercles)
-[I]- 2nd rib |
-[A]- BiL: Elevate ribs during inhalation.
UniL: w/fixed ribs, laterally flex neck to same side. Rotate head & neck to opp. side |
-[O]- Trans Process C-5 & C-6 (post. tubercles) |
-[I]- 2nd rib |
mr. charles11
