Chapter 10
The Muscular System
335
10
MUSCLE GALLERY
Table 10.3
(continued)
MUSCLE
DESCRIPTION
ORIGIN (O) AND
INSERTION (I)
ACTION
NERVE
SUPPLY
PHARYNGEAL CONSTRICTOR MUSCLES
(far-rin
9
je-al)
Superior, middle, and
inferior pharyngeal
constrictor muscles
Three paired muscles
whose fibers run circularly
in pharynx wall; superior
muscle is innermost and
inferior one is outermost;
substantial overlap
O—attached anteriorly
to mandible and
medial pterygoid plate
(superior), hyoid bone
(middle), and laryngeal
cartilages (inferior)
I—posterior median
raphe of pharynx
Constrict pharynx
during swallowing
,
which propels food
to esophagus (via a
massagelike action called
peristalsis)
Pharyngeal plexus
[branches of vagus
nerve (X)]
Mylohyoid
Anterior
belly
Posterior
belly
Stylohyoid
(cut)
Thyrohyoid
Thyroid cartilage
of the larynx
Median raphe
Sternothyroid
Stylohyoid
Hyoid bone
Omohyoid
(superior belly)
Sternohyoid
Sternocleido-
mastoid
Omohyoid
(inferior belly)
Platysma
(cut)
Digastric
Thyroid gland
(a)
Buccinator
Tensor veli palatini
Levator veli palatini
Superior pharyngeal
constrictor
Middle pharyngeal
constrictor
Hyoid bone
Thyrohyoid
membrane
Inferior
pharyngeal
constrictor
Esophagus
Mandible
Mylohyoid
(cut)
Geniohyoid
Hyoglossus
Thyroid
cartilage
of larynx
Trachea
Styloid process
(c)
(b)
Figure 10.9
Muscles of the anterior neck and throat
used in swallowing.
(a)
Anterior view of the suprahyoid
and infrahyoid muscles. The sternocleidomastoid muscle (not
involved in swallowing) is shown on the right side of the
illustration to provide an anatomical landmark. Deeper neck
muscles are illustrated on the left side. Note that a raphe is
a seam of fibrous tissue.
(b)
Cadaver photo of suprahyoid
and infrahyoid muscles. (For related images, see
A Brief Atlas
of the Human Body
, Figures 44 and 45.)
(c)
Lateral view of
the constrictor muscles of the pharynx shown in their proper
anatomical relationship to the buccinator (a chewing muscle)
and the hyoglossus muscle (which moves the tongue).
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