2.11 Anatomy Chapter 11

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    Orbicularis oculi (25)

    Primary action: closes eye
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    Orbicularis oris (32)

    Primary action: close and protrude lips
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    Zygomaticus major/minor

    • Primary action: create smile; facial expression
    • Main Origin: zygomatic bone

    Main Insertion: skin and muscles at corners of mouth
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    Buccinator (35)

    • Primary action: compress cheeks; whistle; important for suckling
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    • Primary action: depress mandible
    • Main Origin: fascia of chest
    • Main Insertion: mandible
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    Temporalis (39)

    • Primary action: close jaw
    • Main Origin: temporal bone
    • Main Insertion: coronoid process of the mandible
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    Masseter (38)

    • Primary action: close jaw
    • Main Origin: zygomatic arch
    • Main Insertion: angle of mandible
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    Digrastric (43)

    • Primary action: open mouth
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    Mylohyoid (45)

    Primary action: elevate tongue during swallowing
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    Sternohyoid (46)

    • Primary action: depress larynx
    • Main Origin: manubrium

    Main Insertion: hyoid
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    Sternocleidomastoid (41) 74

    • Primary action: flex neck, rotate head
    • Main Origin: manubrium and clavicle

    Main Insertion: mastoid process of temporal bone
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    Rectus abdominis (66)

    • Primary action: flexes and rotates spine
    • Main Origin: pubic crest

    Main Insertion: costal cartilage 5-7, xiphoid process
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    External oblique (65)

    Primary action: laterally rotate and flex trunk
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    Internal oblique (just inferior to external oblique)

    Primary action: laterally rotate and flex trunk
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    Transversus abdominis (67); inferior to the internal oblique

    Primary action: compress abdomen
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    Levator ani

    Primary action: support pelvic viscera
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    External urethral sphincter

    Primary action: constrict urethra
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    External intercostals (62)

    Primary action: elevate rib cage in inspiration
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    Internal intercostals (63)

    Primary action: depress rib cage in forced expiration
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    Erector spinae

    • Primary action: extend and laterally flex vertebral column
    • Tripartite muscle: iliocostalis (lateral), longissimus, and spinalis (medial)
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    Diaphragm (162)

    Primary action: prime mover of inspiration
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    Pectoralis minor (59)

    • Primary action: pull scapula down and forward
    • Main Origin: anterior surface of ribs 3-5
    • Main Insertion: coracoid process of scapula
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    Serratus anterior (61)

    Primary action: play role in push or punch of arm
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    Trapezius (50)

    • Primary action: stabilizes scapula; shrug shoulders
    • Main Origin: occipital bone; spines of C7-T12

    Main Insertion: acromion & spine of scapula; lateral clavicle
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    Rhomboid major/minor

    Primary action: stabilize and retract scapula; shoulders back
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    Pectoralis Major (58)

    • Primary action: flex, adduct and medially rotate humerus
    • Main Origin: clavicle, sternum, costal cartilages 1-6
    • Main Insertion: greater tubercle of humerus
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    Latissimus dorsi (56)

    • Primary action: extend, adduct, and medially rotate humerus
    • Main Origin: spinus process of T6-L5; ribs 9-12; iliac crest

    Main Insertion: intertubercular sulcus of humerus
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    Teres major (57)

    Primary action: extend, adduct, and medially rotate humerus
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    • Primary action: abduct humerus
    • Main Origin: acromion and spine of scapula; lateral clavicle
    • Main Insertion: deltoid tuberosity of humerus
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    Infraspinatus (60)

    Primary action: laterally rotate humerus
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    Supraspinatus 31

    Primary action: abduct humerus
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    Teres minor 32

    Primary action: laterally rotate humerus
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    Primary action: medially rotate humerus
Card Set:
2.11 Anatomy Chapter 11
2010-09-29 01:34:11
Muscles Body Part1

Biol 4 Muscle List Only: Head, Neck, Trunk, Pectoral Girdle, Shoulder Joint
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