1. Superificial muscles (anterior view)

3. Exhibits in Ch. 11 Overview Muscle names Origins, insertions, actions
Activity
innervation

4. Groups of axial muscles
Head and neck- facial expressions, chewing,
swallowing
Muscles of the spine- flexors and extensors
of the spinal column
Muscles of the trunk- walls of the thoracic and
abdominopelvic cavities; floor of the
pelvic cavity

5. Muscles of facial expression often insert into skin (p. 298)
Scalp muscles
Orifices
All muscles of facial expression innervated by facial nerve (VII)
Except levator palpebrae superioris (opens eye): oculomotor (III)

6. Examples of muscles of facial expression
origin
insertion
action
Zygomaticus major
Zygomatic bone
Skin at angle of mouth and orbicularis orbis
Smiling, laughing
Levator labii superioris
Superior to intraorbital formen
Skin at angle to mouth and orbicularis orbis
Raise upper lip
Buccinator
maxilla
Orbicularis oris
chewing
Risorius
Fascia over parotid gland
Skin at angle of mouth
Lateral movement of mouth
Mentalis
mandible
Skin of chin
pouting

7. Right lateral superficial view

8. Movement of eye

9. Muscles that move the mandible
Masseter strongest for chewing

10. Muscles of anterior neck, p. 309
Suprahyoid
Infrahyoid
Hyoid serves as base of tongue
Which tend to raise, which tend to lower?

11. Floor of oral cavity and front of neck, p. 308-9

12. Triangles are important for support
Anterior: glands, arteries and nerves
Posterior: likewise

13. Largest group of muscles associated with
mouth
Orbicularis oris- opening
Buccinator- compresses cheeks
Masseter and temporalis- chewing
Other, smaller groups control movements of eyes,
scalp, ears, movements of jaw, etc.

14. Consider how these groups of muscles contribute to movement Laboratory observation: arrangement, appearance, relation to other tissues