BIO 205 Lecture Notes - Lecture 7: Palmaris Longus Muscle, Triceps Brachii Muscle, Medial Pectoral Nerve
2 Feb 2017
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Document Summary
Frontalis frontalis (1) two muscles located superior to the orbits of the eye and comprise the musculature of the forehead. Frontalis muscles are involved with elevation of the eyebrows. Orbicularis oculi (2) is a circular muscle surrounding the orbit of the eye. The orbital part (2a) of orbicularis oculi courses around the periphery of the eye orbit. Orbicularis oculi comprises the musculature of the eyelids and is responsible for blinking actions. The levator labii superioris muscles (3) are located superior to the mouth and course superiorly along either side of the nose. These muscles are typically involved with elevation of the upper lip. Zygomaticus major (4) zygomaticus minor both muscles are involved with elevation of the corners of the mouth upon smiling. Risorius (5) inserts upon the corners of the mouth and, like zygomaticus major and minor, is also involved with elevation of the corners of the mouth upon smiling.
