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Muscle Unit

Terms in this set (72)

Tibialis anterior
O: Lateral condyle of tibia
I: Cuneiform and metatarsals
A: Prime mover of dorsiflexion
Tibialis posterior
O: Tibia, fibula
I: Medial malleolus of tibia, metatarsals
A: Foot inversion
Gastrocnemius
O: Medial and lateral condyles of femur
I: Calcaneus
A: Plantar flexes foot
Soleus
O: Tibia, fibula
I: Calcaneus
A: Plantar flexion
Semitendinosus
O: Ischial tuberosity
I: Tibia
A: Extend thigh, flex leg
Semimembranosus
O: Ischial tuberosity
I: Medial condyle of tibia
A: Extend thigh, flex leg
Biceps femoris
O: Ischial tuberosity
I: Head of fibula, lateral condyle of tibia
A: Extend thigh, flex leg
Rectus femoris
O: Anterior inferior iliac spine and acetabulum
I: Tibial tuberosity and patella
A: Extend leg, flex thigh
Vastus intermedius
O: Femur
I: Tibial tuberosity and patella
A: Extend leg
Vastus medialis
O: Linea aspera of femur and intertrochanteric line of femur
I: Tibial tuberosity and patella
A: Extend leg, stabilize patella
Vastus lateralis
O: Greater trochanter, linea aspera, and intertrochanteric line of femur
I: Tibial tuberosity and patella
A: Extend leg, stabilize patella
Sartorius
O: Anterior superior iliac spine
I: Tibia
A: Flex, abduct, laterally rotate thigh; flex leg
Gracilis
O: Inferior ramus and body of pubis
I: Medial condyle of tibia
A: Adduct thigh, flex and medially rotate leg
Fascia Latae
ITB band
Tensor fasciae latae
O: Iliac crest and anterior superior iliac spine
I: ITB
A: Steady trunk
Pectineus
O: Pubis
I: Lesser trochanter to linea aspera of femur
A: Adduct, flex, and medially rotate thigh
Adductor longus
O: Pubic symphysis
I: Linea aspera of femur
A: Adduct and medially rotate thigh, flex thigh
Adductor magnus
O: Ischial and pubic ramus, ischial tuberosity
I: Linea aspera of femur
A: Adduct and medially rotate thigh, flex thigh
Gluteus Maximus
O: Ilium, sacrum, coccyx
I: Femur, ITB
A: Thigh extensor
Brachialis
O: Humerus
I: Coronoid process of ulna
A: Forearm flexor
Biceps brachii
O: Short head is coracoid process of scapula, long head is glenoid cavity of scapula
I: Radial tuberosity
A: Flexion and supination of forearm
Triceps brachii
O: Lateral head is humerus, medial head is humerus, long head is glenoid cavity of scapula
I: Olecranon of ulna
A: Forearm extension
Linea alba
Aponeurosis of external oblique and transversus
CT tendon sheath from sternum to pubic symphysis
Erector spinae
O: Iliac crest, transverse process of vertebrae, ribs
I: Ribs and transverse process of vertebrae
A: Extend and bend vertebral column laterally
Teres minor
O: Scapula
I: Greater tubercle of humerus
A: Lateral rotation of arm
Teres major
O: Scapula
I: Humerus
A: Extend, medially rotate, and adduct arm
Infraspinatus
O: Infraspinous fossa of scapula
I: Greater tubercle of humerus
A: Lateral arm rotation
Supraspinatus
O: Supraspinous fossa of scapula
I: Greater tubercle of humerus
A: Abduction of arm
Subscapularis
O: Subscapular fossa of scapula
I: Humerus, shoulder joint
A: Medially rotate arm, stabilize shoulder joint
Levator Scapulae
O: Transverse process of vertebrae
I: Medial border of scapula
A: Elevate and adduct scapula
Rhomboids
O: Spinous processes of vertebrae
I: Medial border of scapula
A: Stabilize scapula
Latissimus dorsi
O: Spinous process of vertebrae, ribs, iliac crest
I: Humerus
A: Arm extension, adduct and medially rotate arm
Deltoid
O: Clavicle
I: Humerus
A: Arm abduction
Serratus anterior
O: Ribs
I: Scapula
A: Protect and hold scapula against chest wall, rotate scapula
Pectoralis minor
O: Ribs
I: Coracoid process of scapula
A: Draws scapula forward and inferiorly
Pectoralis major
O: Clavicle, sternum, ribs, external oblique
I: Humerus
A: Arm flexion, adduct and medially rotates arm
Transversus abdominis
O: Iliac crest, inguinal ligament, ribs, lumbar fascia
I: Linea alba and pubic crest
A: Compress abdominal contents
Internal Oblique
O: Lumbar fascia, iliac crest, inguinal ligament
I: Linea alba, pubic crest, ribs
A: Flex and rotate vertebral column, compress abdominal wall, trunk rotation, lateral flexion
External Oblique
O: Ribs
I: Linea alba, pubic crest, iliac crest
A: Flex and rotate vertebral column, compress abdominal wall, trunk rotation, lateral flexion
Rectus abdominis
O: Pubic crest and symphysis
I: Xiphoid process and ribs
A: Flex and rotate vertebral column
Diaphragm
O: Vertebrae, ribs, sternum
I: Central tendon
A: Inspiration, flattens on contraction
Internal intercostal
O: Rib
I: Rib
A: Draw ribs together to depress rib cage
External intercostal
O: Rib
I: Rib
A: Pulls ribs towards one another to elevate rib cage
Masseter
O: Zygomatic arch and zygomatic bone
I: Angle and ramus of mandible
A: Jaw closure
Platysma
O: Chest and deltoid
I: Mandible, skin, muscle at mouth corner
A: Tense neck skin
Sternocleidomastoid
O: Manubrium of sternum & clavicle
I: Mastoid process of temporal bone, occipital bone
A: Neck flexion, rotate head toward shoulder of opposite side
Sternohyoid
O: Manubrium of sternum & clavicle
I: Hyoid bone
A: Depress larynx and hyoid bone
Orbicularis oris
O: Maxilla and mandible
I: Muscle and skin of mouth
A: Closes lips
Levator labii superioris
O: Zygomatic bone, maxilla
I: Skin and muscle of upper lip
A: Opens lips
Orbicularis occuli
O: Frontal bone, maxilla, orbit ligaments
I: Eyelids
A: Closes eyes
Epicranius
O: Frontal is epicranial aponeurosis, occipital is occipital and temporal bones
I: Frontal is skin of eyebrows and root of nose, occipital is epicranial aponeurosis
A: Raise eyebrows, fix aponeurosis, pull scalp posteriorly
Digastric
O: Mandible, mastoid process of temporal bone
I: Hyoid bone
A: Open mouth and depress mandible
Scalenes
O: Transverse process of vertebrae
I: Ribs
A: Elevate ribs
Buccinator
O: Maxilla, mandible
I: Orbicularis oris
A: Compress cheek
Zygomaticus
O: Zygomatic bone
I: Skin and muscle at mouth corner
A: Raise lateral corners of mouth up
Splenius
O: Spinous process of vertebrae
I: Mastoid process of temporal bone, occipital bone, transverse process of vertebrae
A: Extend or hyperextend head
Trapezius
O: Occipital bone, spine of vertebrae
I: Acromion and spinous process of scapula, clavicle
A: Raise, rotate, and adduct scapula
Flexor digitorum longus
O: Tibia
I: Phalanges
A: Flex toes, plantar flexion, invert foot
Fibularis longus
O: Head of fibula
I: Medial cuneiform, metatarsals
A: Plantar flexion
Extensor digitorum longus
O: Lateral condyle of tibia, fibula
I: Phalanges
A: Toe extension
Gluteus medius
O: Ilium
I: Greater trochanter of femur
A: Abduct and medially rotate thigh
Piriformis
O: Sacrum, greater sciatic notch
I: Greater trochanter of femur
A: Laterally rotate hip
Psoas Major
O: Transverse process of vertebrae
I: Lesser trochanter of femur
A: Flex trunk and thigh
Iliacus
O: Sacrum, iliac fossa and crest
I: Lesser trochanter of femur
A: Flex trunk and thigh
Supinator
O: Lateral epicondyle of humerus, Ulna
I: Radius
A: Supinate forearm
Extensor carpi ulnaris
O: Lateral epicondyle of humerus, Ulna
I: Metacarpal V
A: Extend and adduct hand
Flexor carpi ulnaris
O: Medial epicondyle of humerus, olecranon of ulna
I: Metacarpal V, pisiform, hamate
A: Flex and adduct hand
Extensor Digitorum
O: Lateral epicondyle of humerus
I: Phalanges
A: Finger extension
Palmaris Longus
O: Medial epicondyle of humerus
I: Skin of palm
A: Tense skin of palm
Brachioradiales
O: Humerus
I: Radial styloid process
A: Forearm flexion
Flexor carpi radiales
O: Medial epicondyle of humerus
I: Metacarpals
A: Flexes and abducts hand
Pronator Teres
O: Medial epicondyle of humerus, coronoid process of ulna
I: Radius
A: Pronate forearm
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