Some muscles Flashcards
Zygomaticus
Description
Origin
Insertion
Function
Extends from cheek bone to corner of mouth
Zygomatic bone
Skin & muscle of corner of mouth
Smile
Depressor libii inferioris
Description
Origin
Insertion
Function
Runs from mandible to lower lip
Mandible
Skin & muscle of lower lip
Pout
Orbicularis oris
Description
Origin
Insertion
Function
Runs in a circular pattern around mouth
Maxilla & mandible
Skin & muscle of mouth
Kissing & whistling
Platysma
Sheet of muscle in neck
Fascia over pecs and deltoids
mandible
Tenses skin of neck for shaving
Masseter
Covers the lateral aspect of the mandibular ramus
Zygomatic arch & maxilla
mandible
Closes jaw as in chewing
Sternocleidomastoid
Cordlike muscle of neck
Manubrium and clavicle
Mastoid process of temporal bone
Left-turns head to right; right-turns head to left
External intercostals
11 pairs between ribs. Forms part of chest wall
Rib above
Rib below
Muscle of inspiration. Elevates rib cage
Internal intercostal
11 pairs between ribs.Forms part of chest wall
Rib below
Rib above
Muscle of forced expiration. Depresses rib cage
Diaphragm
Separates thoracic from abdominal cavities
Inferior border of ribs and sternum
Central tendon of diaphragm
Muscle of inspiration
Rectus abdominis
The 6 pack
Pubic crest and symphysis pubis
Xiphoid process & costal cartilage of ribs 5 - 7
Flexes vertebral column. “Used in sit ups & curls
Trapezius
Flat muscle of back of neck and shoulder
Occipital bone & spines of thoracic vertebrae
Acromium & spinous process of capula & clavicle
Raises scapula as in shrugging shoulders
Pectoralis major
Covers chest
Clavicle, sternum & costal cartilage of ribs 1 - 8
Humerus
Pulls arm forward and across chest
Pectoralis minor
Lies directly under pectoralis major
Anterior surface of ribs 3 -5
Coracoid process of scapula
Draw scapula forward
Latissimus dorsi
Muscle of lower back
Thoracic & lumbar vertebrae, lower ribs, iliac crest
Humerus
Extends and adducts arm. Provides power for hammering, rowing, swimming
Deltoids
Covers and rounds shoulder
Clavicle & scapula
Humerus
Abducts arm
Triceps brachii
Muscle on posterior side of upper arm
Long head-inferior margin of glenoid cavity. Lateral head-posterior humerus. Medial head-distal radial groove of humerus
Olecranon process of ulna
Extends forearm at elbow
Biceps brachii
Muscle on anterior part of upper arm
Short head-coracoid process. Long head-supraglenoid tubercle and lip of glenoid cavioty.
Radial tuberosity
Flexes forearm at elbow
Quadriceps femoris (includes rectus femoris, vastus lateralis, vastus medius & vastus intermedius)
Muscle of anterior and lateral side of thigh
Femur
Tibiald tuberosity and patella
Flexes hip & extends knee
Hamstrings(includes biceps femoris, semtendinosis & semimembranosus
Posterior part of thigh
Ischial tuberosity & femur
Tibia
Extends thigh & flexes knee
Sartorius
Longest muscle in body, crosses thigh
Iliac spine
Tibia
Tailor’s muscle, for crossing legs
Gluteus maximus
The buttucks
Ilium, sacrum & coccyx
Femur
Extends thigh
Gastocnemius
Muscle of posterior calf with two bellies
Femur
Calcaneus
Plantar flexes foot, as in standing on toes
Soleus
Under gastroc
Tibia & fibula
Calcaneus
Plantar flexion
