Muscles Head, Neck, and Trunk Flashcards
OIA's
Buccinator
A: Compresses cheek, pulls corner of mouth laterally
- whistling
- mastication
Orbicularis oris
A: Closes and protrudes lips
Orbicularis oculi
A: Closes eyelids
Platysma
O: Skin & fascia of shoulder & upper chest
I: Mandible, skin near lips, & corner of mouth
A: depresses mandible, draws corners of mouth downward
Temporalis
O: Temporal fossa, temporal aponeurosis
I: coronoid process of the mandible
A: elevates and retracts mandible
Masseter
O: Zygomatic arch
I: Angle & ramus of the mandible
A: elevates mandible
Lateral pterygoid
O: ateral surface of lateral pterygoid plate
I: anterior surface of the condyloid process & the capsule of the joint
A: protraction and depression of lower jaw
Medial pterygoid
O: medial surface of lateral pterygoid plate
I: internal surface of angle of mandible
A: elevates & protracts mandible
Stylohyoid
O: styloid process of temporal bone
I: Hyoid bone
A: draws hyoid posteriorly
Omohyoid
O: superior border of the scapula
I: hyoid bone
A depresses hyoid, draws it posteriorly
Sternohyoid
O: manubrium of the sternum (and medial clavicle)
I: body to the hyoid
A: depresses hyoid
Sternothyroid
O: manubrium of the sternum
I: Thyroid cartilage
A: depresses thyroid
Thyrohyoid
O: Thyroid cartilage (larynx)
I: hyoid bone
A: depresses hyoid & elevates thyroid cartilage
Scaleni:
Scalenus anterior
Scalenus medius
Scalenus posterior
O: transverse process of C2-C6
I: first and second ribs
A: elevate ribs
Semispinalis capitis
O: transverse process of T1-T6
I: between the superior & inferior nuchal lines
A: extends the head
Splenius capitis
O: spinous process of the lower cervical & upper thoracic vertibrae
I: mastoid process, lateral superior nuchal line
A: both: extend head
Individual: turn face to the same side
External intercostals
A: elevate ribs in inspiration
Internal intercostals
A: depresses ribs in expiration
External oblique
O: external surface of ribs 5-12
I: linea alba, iliac crest
A: compresses abdomen, flexes & rotates trunk
Internal oblique
O: thoracolumbar aponeurosis, iliac crest
I: linea alba, inferior border of ribs 10-12
A: compresses abdomen, flexes & rotates trunk
Transverse abdominis
O: ribs 7-12, thoracolumbar aponeurosis, iliac crest
I: linea alba
A: compresses abdomen
Rectus abdominis
O: pubic symphysis
I: xiphoid process & costal cartilages of ribs 5-7
A: compress abdomen; flexes trunk; depresses ribs
Diaphragm
O: xiphoid process, ribs 7-12, costal cartilages
I: central tendon
A: expands thoracic cavity, compresses abdominopelvic cavity
1) Iliocostalis
2) Longissimus
3) Spinalis
A: Chief extensors of the vertebral column
