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AAAC67 21/5/05 11:01 AM Page 148
67 The face and scalp

Frontal belly of occipitofrontalis
Temporalis
Orbicularis oculi
Zygomaticus major
Zygomaticus minor
Levator labii superioris (elevator of the upper lip)
Buccinator
Levator anguli oris (elevator of the angle of the mouth)
Orbicularis oris
Outline of parotid (salivary) gland
Masseter
Depressor anguli oris (depressor of the angle of the mouth)
Depressor labii inferioris (depressor of the lower lip)
Fig.67.1 Platysma
The principal muscles of facial expression and two of the muscles of mastication, temporalis and masseter

The facial muscles 67.1, from which their actions can be deduced. The orbicularis oculi
• Muscles of mastication: see Muscle index, p. 167. They are all sup- has an orbital part which surrounds the eye as a sphincter and closes the
plied by the mandibular division of the trigeminal (p. 129). eye tightly, while the palpebral part, which is in the eyelid, closes the
• Muscles of facial expression: they are all supplied by the facial eye gently as in sleep. The most important function of the buccinator is
nerve. They have only one attachment to bone, or sometimes no attach- to keep the cheeks in contact with the gums so that food does not collect
ment at all, the other end of the muscle being inserted into skin or in this region. The platysma extends down the neck and over the clavi-
blending with other muscles. The most important are shown in Fig. cle and upper part of the chest.

148 Head and neck