. Anatomy of the woodchuck (Marmota monax). Woodchuck; Mammals. 48 Anatomy of the Woodchuck, Marmota monax. Fig. 4-3. Head and neck, left lateral view. 1 cervical trapezius m., 2 stemocephalic m., 3 cleidocephalic m. (combined mastoid and occipital parts), 4 cutaneus colli m., 5 masseter m., 6 digastric m. (rostral belly, cutaneus colli removed), 7 orbicularis oris m., 8 buccinator m., 9 levator nasolabialis m., 10 orbicularis oculi m. (maxillonasalis of Bryant, 1945), takes origin from the fascia of the masseter muscle ventral to the me- dial canthus of the eye. It has a long, flat tendon of
. Anatomy of the woodchuck (Marmota monax). Woodchuck; Mammals. 48 Anatomy of the Woodchuck, Marmota monax. Fig. 4-3. Head and neck, left lateral view. 1 cervical trapezius m., 2 stemocephalic m., 3 cleidocephalic m. (combined mastoid and occipital parts), 4 cutaneus colli m., 5 masseter m., 6 digastric m. (rostral belly, cutaneus colli removed), 7 orbicularis oris m., 8 buccinator m., 9 levator nasolabialis m., 10 orbicularis oculi m. (maxillonasalis of Bryant, 1945), takes origin from the fascia of the masseter muscle ventral to the me- dial canthus of the eye. It has a long, flat tendon of insertion that passes to the dorsum of the nose where it inserts, in common with the muscle from the opposite side, into the fascia in the apex of the nose. It lies deep to the levator naso-labialis muscle. Innervation: N. facialis. The frontal muscle, m. frontalis (preauricularis of Bryant, 1945), is a small muscle that takes origin from the supraorbital margin and fans out laterally to insert on the fascia deep to the temporal cuta- neous glands. The latter is situated between the lat- eral canthus of the eye and the ear. Innervation: N. facialis. Muscles of the Eyelids. The orbicularis oculi muscle, m. orbicularis oculi, is a thin muscle that surrounds the eye. It lies within the eyelids and can be divided into superior (upper) and inferior (low- er) parts. It serves to close the eyelids. Innervation: N. facialis. The malar muscle, m. malaris, is a thin muscular sheet that extends from the lower eyelid into the fascia below the eye. It pulls the lower eyelid ven- trally. Innervation: N. facialis. The retractor of the lateral angle of the eye, m. retractor anguli oculi lateralis (Bryant, 1945, consid- ers this muscle part of the orbicularis oculi), is a flat muscle band that extends caudoventrally from the lateral canthus of the eye to the temporal fascia and the zygomatic arch. It retracts the lateral can- thus of the eye. Innervation: N. facialis. The levator of the upper e
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