Head and Neck Muscles Figure 6.15
Head and Neck Muscles Facial muscles Frontalis—raises eyebrows Orbicularis oculi—closes eyes, squints, blinks, winks Orbicularis oris—closes mouth and protrudes the lips Buccinator—flattens the cheek, chews Zygomaticus—raises corners of the mouth Chewing muscles Masseter—closes the jaw and elevates mandible Temporalis—synergist of the masseter, closes jaw
Head and Neck Muscles Neck muscles Platysma—pulls the corners of the mouth inferiorly Sternocleidomastoid—flexes the neck, rotates the head
Head and Neck Muscles Figure 6.15
Anterior Muscles of Trunk, Shoulder, Arm Figure 6.16a
Muscles of Trunk, Shoulder, Arm Anterior muscles Pectoralis major—adducts and flexes the humerus Intercostal muscles External intercostals—raise rib cage during inhalation Internal intercostals—depress the rib cage to move air out of the lungs when you exhale forcibly
Anterior Muscles of Trunk, Shoulder, Arm Figure 6.16a
Anterior Muscles of Trunk, Shoulder, Arm Figure 6.16b
Muscles of Trunk, Shoulder, Arm Muscles of the abdominal girdle Rectus abdominis—flexes vertebral column and compresses abdominal contents (defecation, childbirth, forced breathing) External and internal obliques—flex vertebral column; rotate trunk and bend it laterally Transversus abdominis—compresses abdominal contents
Anterior Muscles of Trunk, Shoulder, Arm Figure 6.16b
Muscles of Trunk, Shoulder, Arm Posterior muscles Trapezius—elevates, depresses, adducts, and stabilizes the scapula Latissimus dorsi—extends and adducts the humerus Erector spinae—back extension Quadratus lumborum—flexes the spine laterally Deltoid—arm abduction
Muscles of Posterior Neck, Trunk, Arm Figure 6.17a
Muscles of Posterior Neck, Trunk, Arm Figure 6.17b
Muscles of the Upper Limb Biceps brachii—supinates forearm, flexes elbow Brachialis—elbow flexion Brachioradialis—weak muscle Triceps brachii—elbow extension (antagonist to biceps brachii)
Anterior Muscles of Trunk, Shoulder, Arm Figure 6.16a
Muscles of Posterior Neck, Trunk, Arm Figure 6.17a
Muscles of the Lower Limb Gluteus maximus—hip extension Gluteus medius—hip abduction, steadies pelvis when walking Iliopsoas—hip flexion, keeps the upper body from falling backward when standing erect Adductor muscles—adduct the thighs
Muscles of the Pelvis, Hip, Thigh Figure 6.19a
Muscles of the Pelvis, Hip, Thigh Figure 6.19c
Muscles of the Lower Limb Muscles causing movement at the knee joint Hamstring group—thigh extension and knee flexion Biceps femoris Semimembranosus Semitendinosus
Muscles of the Pelvis, Hip, Thigh Figure 6.19a
Muscles of the Lower Limb Muscles causing movement at the knee joint Sartorius—flexes the thigh Quadriceps group—extends the knee Rectus femoris Vastus muscles (three)
Muscles of the Pelvis, Hip, Thigh Figure 6.19c
Muscles of the Lower Limb Muscles causing movement at ankle and foot Tibialis anterior—dorsiflexion and foot inversion Extensor digitorum longus—toe extension and dorsiflexion of the foot Fibularis muscles—plantar flexion, everts the foot Soleus—plantar flexion
Muscles of the Lower Leg Figure 6.20a
Muscles of the Lower Leg Figure 6.20b
Superficial Muscles: Anterior Figure 6.21
Superficial Muscles: Posterior Figure 6.22
Superficial Anterior Muscles of the Body Table 6.3 (1 of 3)
Superficial Anterior Muscles of the Body Table 6.3 (2 of 3)
Superficial Anterior Muscles of the Body Table 6.3 (3 of 3)
Superficial Posterior Muscles of the Body Table 6.4 (1 of 3)
Superficial Posterior Muscles of the Body Table 6.4 (2 of 3)
Superficial Posterior Muscles of the Body Table 6.4 (3 of 3)
Intramuscular Injection Sites Figure 6.18, 6.19b, d