Axial Skeleton Flashcards
Orbicularis Oculi
O: frontal bone, maxilla
I:eyelids
A:blinking and squinting
Orbicularis Oris
O: Maxilla, Mandible
I: Lips
A: Closes Lips
Zygomaticus (muscle for face expression)
O: zygomatic Bone
I: Edge of Orbicularis oris
A: draws angles of mouth upward and backward to smile
Make a happy face
Risorious (muscle for face expression)
O: Angle of mandible
I: Skin at angle of mouth
A: draws corner of mouth laterally
Make a straight face
Triangularis (muscle for face expression)
O: lateral aspect of mandible
I: lateral to orbit. Oris
A: draws angles of mouth down
Make a sad face
Mentalis (muscle for face expression)
O: mandible
I: skin of chin
A: protrudes lower lip
Curling your lip
Buccinator (muscle for face expression)
O: molar region of mandible and maxilla
I: orbicularis oris A
A: draws corner of mouth laterally; assists in placing food or chewing
Masseter (muscle for chewing)
O: zygomatic arch
I: angle of mandible
A: elevates the mandible
Temporalis (muscle for chewing)
O: Parietal Bone
I: coronoid process of mandible
A: elevates the mandible
Suprahyoid muscles
Found in anterior triangle of neck above the hyoid bone; this elevates the hyoid.
Infrahyoid muscle
Found in anterior triangle of neck below the hyoid bone
Sternocleidomastoid (anterolateral neck muscles)
O: Sternum and clavicle
I: mastoid process of temporal bone
A: flexion of neck, assist’s inhalation
Splenius ( post. muscles of neck and vertebral column)
O: midline of C Vertebrae
I: mastoid process
A: extend neck
External intercostals (muscle of deep thorax for breathing)
O: superior border of rib below
I: inferior border of rib above
A: depresses floor of thorax for inhalation, can compress the contents of the abdomen
Rectus abdominus (muscle of abdominal wall)
O: pubic crest, symphysis pubis
I: ribs 5-7, xiphoid process
A: flexes vertebral column
External oblique (muscle of abdominal wall)
O: ribs 5-12
I: linea alba
A: flexes vertebral column
Internal oblique (muscle of abdominal wall)
O: superior edge pelvic girdle
I: ribs 10-12, alba, pubis
A: flexes vertebral column
Transversus abdominis (muscle of abdominal wall)
O: iliac crest, inguinal ligament, ribs 7-12
I: xiphoid, linea alba, pubis
A: compresses abdominal contents; can elevate resting diaphragm to assist exhalation
Serratus anterior ( superficial muscles of the thorax)
O: upper 8 or 9 ribs
I: anterior surface of scapula, near vertebral border
A: protracts scapula
Posterior Trapezius (superficial muscles of thorax)
O: midline of upper spine
I: acromion process and spine of scapula + lateral clavical
A: retract (adduct) scapula, extend neck
Pectoralis major (muscles that crosses shoulder joint, and acts on humerus)
O: clavical, sternum and cartilage of ribs 1-6
I: greater tubercle of humerus
A: flexes whole arm and adducts whole arm and rotates whole arm medially
Latissimus dorsi (muscle that crosses shoulder joint, and acts on humerus)
O: from midline of lumbar spine
I: anterior humerus between the tubercles
A: extends whole arm and adducts whole arm and rotates whole arm medially
Deltoid (muscle that crosses shoulder joint, and acts on humerus)
O: lateral aspect of the pectoral girdle
I: deltoid tuberosity of the humerus
A: abduction of whole arm
Triceps brachii ( anterior flexors)
O: long head tubercle above glenoid cavity
Short head: coracoid process of scapula
I: radial tuberosity
A: flexes forearm and supinates palm
Brachialis (anterior flexor)
O: distal, anterior humerus
I: cornoid process of ulna
A: flexes arm
Brachioradialis (anterior flexor)
O: lateral epicondyle of humerus
I: distal, lateral radius above styloid process
A: flexes forearm
Muscles of forearm
Move the wrist, hand and fingers
Anterior side: flexors of the wrist
Posterior side: extensors of the wrist
