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Origin and Insertion

Origin, Insertion, and Action of Select Skeletal Muscles

QuestionAnswer
buccinator O: outer surfaces of maxilla and mandible I: orbicularis oris A: compresses cheeks inward
orbicularis oculi O: maxillary and frontal bones I: skin around eye A: closes eye
orbicularis oris O: muscles near the mouth I: skin of central lip A: closes lips
platysma O: fascia in upper chest I: lower border of mandible A: draws angle of mouth downward
zygomaticus O: zygomatic bone I: corner of mouth A: raises corner of mouth
masseter O:lower border of zygomatic arch I: lateral surface of mandible A: elevates mandible
temporalis O: temporal bone I: coronoid process and anterior rams of mandible A: elevates mandible
sternocleidomastoid O: anterior surface of sternum and upper surface of clavicle I: mastoid process of the temporal bone A: pulls head to one side, flexes neck or elevates sternum
pectoralis minor O: sternal ends of upper ribs I: coracoid process of scapula A: pulls scapula forward and downward or raises ribs
serratus anterior O: outer surfaces of upper rips I: ventral surface of scapula A: pulls scapula anteriorly and downward
trapezius O: occipital bone and spines of cervical and thoracic vertebra I: clavical, spine, and acromion process of the scapula A: rotates scapula, various fibers raise scapula, pull scapula medially, or pull scapula and shoulder downward
deltoid O: acromion process, spine of scapula, and the clavicle I: deltoid tuberosity of humerus A: abducts, extends, and flexes arm
infraspinaus O: posterior surface of scapula below spine I: greater tubercle of humerus A: rotates arm laterally
latissimus dorsi O: spines of sacral, lumbar, and lower thoracic vertebrae; illiac crest, and lower ribs I: intertubercular groove of humerus A: extends, adducts, and rotates the arm medially, or pulls the shoulder downward and back
pectoralis major O: clavicle, sternum, and costal cartilages of the upper ribs I: intertubercular groove of humerus A: flexes, adducts, and rotates the arm medially
biceps brachii O: coracoid process and tubercle above glenoid cavity of scapula I: radial tuberosity of radius A: flexes elbow and rotates hand laterally
brachialis O: anterior shaft of the humerus I: coronoid process of ulna A: flexes elbow
brachioradialis O: distal lateral end of humerus I: lateral surface of radius above styloid process A: flexes elbow
triceps brachii O: tubercle below glenoid cavity and lateral and medial surfaces of humerus I: olecranon process of the ulna A: extends elbow
external oblique O: outer surface of the lower ribs I: outer lip of illiac crest and linea alba A: tenses abdominal wall and compresses abdominal compartments
internal oblique O: crest of illium and inguinal ligament I: cartilages of lower ribes, linea alba, and crest of pubis A: tenses abdominal wall and compresses abdominal compartments
transverse abdominus O: costal cartilages of lower ribs, processes of lumbar vertebra, lip of illac crest, and inguinal ligament I: linea alba and crest of pubis A: tenses abdominal wall and compresses abdominal compartments
rectus abdominus O: crest of pubis and symphysis pubis I: xiphoid process of sternum and costal cartilages A: tenses abdominal wall and compresses abdominal compartments, also flexes vertebral column
levator ani O: pubic bones and ischial spine I: coccyx A:supports pelvic viscera and provides sphincterlike action in anal canal and vagina
sphincter urethrae O: margins of pubis and ischium I: fibers unite with those from other side A: opens and closes urethra
adductor longus O: pubic bone near symphysis pubis I: posterior surface of femus A: adducts, flexes, and rotates thigh laterally
adductor magnus O: ischial tuberosit I: posterior surface of femus A: adducts thigh, posterior portion extends and anterior portion flexes thigh
gluteus maximus O: sacrum, coccyx, and posterior surface of illium I: posterior surface of femur and fascia of thigh A: extends hip
iliacus O: iliac fossa of ilium I: lesser thochanter of femus A: flexes thigh
gracilis O: lower edge of symphysis pubis I: medial surface of tibia A: adducts thigh and flexes knee
psoas major O: lumbar intervertebral discs, bodies and transverse processes of lumbar vertebrae I: lesser trochanter of femur A: flexes thigh
biceps femoris O: ischial tuberosity and linea aspera of femur I: head of fibula and lateral condyle of tibia A: flexes knee, rotates leg, and extends thigh
semimembranosus and semitendinosus O: ischial tuberosity I: medial surface of tibia A: flexes knee, rotates leg, and extends thigh
sartorius O: anterior superior iliac spine I: medial surface of tibia A: flexes knee and hip, abducts and rotates thigh laterally
quadricepts femoris I: patella by common tendon, which continues as patellar ligament to tibial tuberosity A: extends knee
fibularis longus O: lateral condyle of tibia and head and shaft of fibula I: tarsal and metatarsal bones A: plantar flexion and eversion of foot, supports arch
gastrocnemius O: lateral and medial condyles of femur I: posterior surface of calcaneus A: plantar flexion of foot, flexes knee
soleus O: head and shaft of fibula and posterior surface of tibia I: posterior surface of calcaneus A: plantar flexion of flot
tibialis anterior O: lateral condyle and lateral surface of tibia I: tarsal bone (cuneiform) and first metatarsal A: dorsiflexion and inversion of the foot
tibialis posterior O: lateral condyle and posterior surface of tibia and posterior surface of fibula I: tarsal and metatarsal bones A: plantar flexion and eversion of foot, supports arch
Created by: abw622
 

 



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