Lab 1&2 muscular system Flashcards
Masseter
Origin, Insertion, Action
O: zygomatic arch
I: mandibular ramus
A:closes jaw
Temporalis
Origin, Insertion, Action
O: Temporal Bone
I: Mandible
A: closes jaw
Sternocleidomastoid
Origin, Insertion, Action
O: Sternum & Clavicle
I: Mastoid process
A: Flexes neck forward (if both contract)
Pectoralis Major
Origin, Insertion, Action
O: Clavicle & Sternum
I: Greater Tubercle (humerus)
A: Flexion, Adduction, & medially rotates arm
Deltoid
Origin, Insertion, Action
O: Acromion & spine of scapula, clavicle
I: deltoid tuberosity
A: Abducts arm
External intercostals
Origin, Insertion, Action
O: lower border of each rib
I: Upper border of next rib
A: Elevate ribcage, inspiration
Internal intercostals
Origin, Insertion, Action
O: Upper border of rib below
I: lower border of rib above
A: depress ribcage, expiration
Rectus abdominis
Origin, Insertion, Action
O: Pubic symphysis
I: Xiphoid process, 5-7 coastal cartilages
A: Flexes vertebral & column abdominal compression
External oblique
Origin, Insertion, Action
O: lower 8 ribs
I: linea alba & iliac crest
A: Flexes vertebral column, abdominal compression, & lateral flexion
Trapezius
Origin, Insertion, Action
O: Occipital bone, spines of thoracic vertebrae
I: Clavicle, spine & acromion of scapula
A: Extends head, adducts, elevates or depresses scapula
Latissimus dorsi
Origin, Insertion, Action
O: lower thoracic vertebrae & lumbar vertebrae
I: humerus
A: Extension, adduction, medially rotation of humerus
Teres major
Origin, Insertion, Action
O: inferior angle of scapula
I: intertubercular groove (humerus)
A: medially rotates & adducts humerus
Rhomboids ( Major and minor)
Origin, Insertion, Action
O: Spinous process upper thoracic vertebrae
I: Vertebral border of scapula
A: adducts & rotates scapula
Biceps bracii (shorthead & long head)
Origin, Insertion, Action
O: Shorthead: coracoid process
Longhead: tubercle above glenoid cavity
I: Radial tuberosity
A: flexion of forearm
Triceps brachii ( Long head, lateral head, medial head)
Origin, Insertion, Action
O: Long head: glenoid cavity
Lateral head: humerus (post.)
Medial head: humerus
I: Ulna (olecranon process)
A: Extension of forearm
Gluteus maximus
Origin, Insertion, Action
O: ilium, sacrum, coccyx
I: Fascia Lata
A: extension of hip ( climbing stairs)
Sartorius
Origin, Insertion, Action
O: ASIS
I: medial aspect of proximal tibia
A: Flexes leg, laterally rotate thigh
Quadriceps femoris
Origin, Insertion, Action
O: arises by 4 heads from ilium and femur
I: tibial tuberosity
A: Leg extension, flexes thigh
Biceps femoris
Origin, Insertion, Action
O: ischial tuberosity & Linea aspera (femur)
I: fibula & tibia
A: Flexes leg, extends & adducts thigh
Gastrocnemius
Origin, Insertion, Action
O: Condyles of femur
I: calcaneus via calcaneal tendon
A: plantar flexion
