Axial MusclesAxial Muscles__

11-11-11

Axial MusclesAxial Muscles

• Have both their origins and insertions on parts Have both their origins and insertions on parts of the axial skeleton. of the axial skeleton. • Move the head and spinal column.Move the head and spinal column.• nonverbal communication nonverbal communication • chewingchewing• swallowingswallowing• Aid breathing.Aid breathing.• Support and protect the abdominal and pelvic Support and protect the abdominal and pelvic

organs.organs.

• Not responsible Not responsible for stabilizing or moving the for stabilizing or moving the pectoral or pelvic girdles or their attached pectoral or pelvic girdles or their attached limbs.limbs.

11-11-22

Muscles of Facial Muscles of Facial ExpressionExpression

• Originate in the superficial fascia or on the Originate in the superficial fascia or on the skull bones. skull bones.

• Insert into the superficial fascia of the skin. Insert into the superficial fascia of the skin.

• Contort Contort the skinthe skin causing it to movecausing it to move. .

11-11-33

44

55

66

77

88

Muscles of MasticationMuscles of Mastication

• Refers to the process of Refers to the process of chewingchewing. .

• Move the mandible at the temporomandibular Move the mandible at the temporomandibular joint. joint.

• Paired muscles of mastication Paired muscles of mastication • temporalis temporalis • masseter masseter

11-11-99

1010

Anterior and Lateral Anterior and Lateral Neck MusclesNeck Muscles

• FlexFlex the head and neck downward. the head and neck downward.• ““neck flexionneck flexion”” and and ““head flexionhead flexion”” refer to the refer to the same same

movementmovement

• The main muscles are the The main muscles are the sternocleidomastoid and the three scalenes. sternocleidomastoid and the three scalenes.

11-11-1111

1212

Posterior Neck MusclesPosterior Neck Muscles

• ExtendExtend the head/neck. the head/neck.

• The trapezius attaches to the skull and helps The trapezius attaches to the skull and helps extend the head/neck. extend the head/neck.

• Primary function is to help move Primary function is to help move the pectoral the pectoral girdle.girdle.

11-11-1313

1414

1515

Muscles of Respiration Muscles of Respiration

• RespirationRespiration involves involves inhalationinhalation and and exhalation.exhalation.• DiaphragmDiaphragm

• Internal intercostalsInternal intercostals

• External intercostalsExternal intercostals

11-11-1616

1717

1818

1919

2020

The DiaphragmThe Diaphragm

• Is an internally placed, Is an internally placed, dome-shapeddome-shaped muscle. muscle.

• Forms a Forms a partitionpartition between the thoracic and between the thoracic and abdominal cavities. abdominal cavities.

• The most important muscle associated with The most important muscle associated with breathing. breathing.

11-11-2121

Muscles of the Muscles of the Abdominal WallAbdominal Wall

• Four pairs of musclesFour pairs of muscles collectively compress collectively compress and and hold the abdominal organs in placehold the abdominal organs in place. . • the external obliquethe external oblique• internal oblique internal oblique • transversus abdoministransversus abdominis• rectus abdominisrectus abdominis

• Work together to Work together to flexflex and and stabilizestabilize the the vertebral column. vertebral column.

• When they unilaterally contract they When they unilaterally contract they laterally laterally flexflex the vertebral column. the vertebral column.

11-11-2222

2323

2424

2525