Muscles Head and Torso - Anatomy and Physiology LAB - Lecture Slides, Slides of Physiology

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Muscles

Head

and

Torso

Muscles of the Anterior Neck and Throat:

Suprahyoid

• Four deep throat muscles
  • Form the floor of the oral cavity– Anchor the tongue– Elevate the hyoid– Move the larynx superiorly during swallowing

• Straplike muscles that depress the hyoid

Muscles of the Anterior Neck and Throat: and larynx during swallowing and speaking

Infrahyoid

Figure 10.8b

Muscles of the Anterior Neck and Throat:

Infrahyoid

Muscles of the Neck: Head Movements

Figure 10.9a

Muscles of the Neck: Head Movements

Figure 10.9b

Trunk Movements: Deep Back Muscles

Figure 10.9d

Trunk Movements: Short Muscles

• Four short

muscles extendfrom onevertebra toanother

• These muscles

are synergistsin extensionand rotation ofthe spine

Figure 10.9e

Muscles of Respiration: The

Diaphragm

Figure 10.10b

Muscles of the Abdominal Wall

• The abdominal wall is composed of four

paired muscles (internal and externalobliques, transversus abdominis, and rectusabdominis), their fasciae, and theiraponeuroses

• Fascicles of these muscles run at right and

oblique angles to one another, giving theabdominal wall added strength

Muscles of the Abdominal Wall

Figure 10.11a

Muscles of the Abdominal Wall

Figure 10.11b

Muscles of the Pelvic Floor (Pelvic

Diaphragm)

• The pelvic diaphragm is composed of two

paired muscles – levator ani and coccygeus

• These muscles:
  • Close the inferior outlet of the pelvis– Support the pelvic floor– Elevate the pelvic floor to help release feces– Resist increased intra-abdominal pressure

Muscles of the Pelvic Floor: Pelvic Diaphragm

Figure 10.12a