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BIOL301 Skeletal Muscle Functions.docx

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Department
Biology
Course
BIOL 301
Professor
Vivian Dayeh
Semester
Winter

Description
Muscles and Their Functions Facial Muscles – Non-verbal communication (Figures 11.8, 11.9) - Orbicularis oculi ▯ surrounds eyes - Zygomaticus (minor and major) - Buccinator - Orbicularis oris  surrounds mouth - Epicranius (Frontal & Occipital belly) - For Mastication  Temporalis (elevate and retract) and Masseter (elevate and protract) Anterior Neck Muscles –Aid in Swallowing (Figure 7.17) - Suprahyoid  mylohyoid, stylohyoid, digastric - Infrahyoid  omohyoid, thyrohyoid, sternothyroid - Superior, middle and inferior pharyngeal constrictors Neck and Vertebral Column – Movement to head and trunk extension (Figure 11.12) - Splenius capitis & cervicis  single turns head; both extends neck (head back) - Sternocleidomastoid  single provides lateral flexion; both flexes neck - Erector spinae (Ilicostalis, Longissimus, Spinalis)  posture and extension - Quadratus lumborum  single provides lateral flexion; both = extension Breathing Muscles (Figure 11.13) - External intercostal  elevates ribs; expands chest (inhalation) - Internal intercostal  depresses ribs; compresses chest (exhalation) - Diaphragm  flattens and expands thoracic cavity upon contraction/exhalation Abdominal Muscles (Figure 11.14) - Transversus abdominis  compression - Internal oblique  lateral flexion and rotation (towards midline of body) - External oblique  lateral flexion and rotation - Rectus abdominis  flexion and rotation (sit-ups) Scapula (Figure 11.16) - Subclavius  stability and pectoral girdle depression - Pectoralis minor  moves scapula forward and downward - Serratus anterior  rotates scapula - Trapezius  elevates, retracts, and rotates scapula - Levator scapulae  elevates/adducts scapula - Rhomboid (minor and major)  stabilize scapula Arm – Anterior and Posterior (Figure 11.17) - Deltoid ▯ abducts, flexes, extend (anterior) - Pectoralis major and coracobrachialis ▯ flexes and adducts (anterior) - Subscapularis  medial rotation of humerus (anterior) - Supraspinatus  abduction (posterior) - Infraspinatus  Lateral rotation of humerus (posterior) - Latissimus dorsi  arm extension; shoulder adduction and medial rotation (posterior) Forearm (Figures 11.18, 11.19) - Flexion ▯ Biceps brachii, brachialis, brachoiradialis - Extension  Triceps b
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