ANAT 201 Lecture Notes - Lecture 7: Inferior Pharyngeal Constrictor Muscle, Levator Scapulae Muscle, Epicranial Aponeurosis
19 Sep 2016
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Anat 201 lecture #7 axial musculature. Genioglossus, hyoglossus, and styloglossus are the three main muscles of chewing and swallowing: genioglossus protrudes tongue or moves it to one side if used unilaterally, hyoglossus depresses tongue, styloglossus pulls tongue up and back. Temporalis, masseter, and medial pterygoid elevate mandible and move it sideways. Lateral pterygoid depresses mandible and moves it sideways. Two groups: suprahyoid group, infrahyoid group. Suprahyoid group: digastric depresses mandible. Inferior belly: sternohyoid depresses hyoid, sternothyroid depresses larynx. Sternocleidomastoid rotates head from side-to-side when unilaterally active, draws head forward when bilaterally active. Diaphragm is the prime mover of inspiration. Muscles: rectus abdominis, external/internal abdominal oblique, transversus abdominis, aponeurosis of: External and internal intercostals: elevate and depress ribs, respectively. Diaphragm: used in inhalation for breathing. External and internal obliques, and trasversus abdominus: compresses abdomen and can flex spine. Rectus abdominis: depresses ribs and flexes spine. Superficial muscles: sternocleidomastoid, trapezius, deltoid, latissimus dorsi, external abdominal oblique.
