CVA A&P - Chapter 6c: Muscle Movements and Major Muscles

PowerPoint® Lecture Slide Presentation by Patty Bostwick-Taylor, Florence-Darlington Technical College

PART C6

The Muscular System

Five Golden Rules of Skeletal Muscle Activity

Table 6.2

Muscles and Body Movements

Movement is attained due to a muscle moving an attached bone

Muscles are attached to at least two points

Origin

Attachment to a moveable bone

Insertion

Attachment to an immovable bone

Muscles and Body Movements

Figure 6.12

Types of Ordinary Body Movements

Flexion

Decreases the angle of the joint

Brings two bones closer together

Typical of hinge joints like knee and elbow

Extension

Opposite of flexion

Increases angle between two bones

Figure 6.13a

Figure 6.13b

Rotation

Movement of a bone around its longitudinal axis

Common in ball-and-socket joints

Example is when you move atlas around the dens of axis (shake your head “no”)

Humerus RotationPLAYFigure 6.13c

Abduction

Movement of a limb away from the midline

Adduction

Opposite of abduction

Movement of a limb toward the midline

Figure 6.13d

Humerus Adduction/AbductionPLAY

Circumduction

Combination of flexion, extension, abduction, and adduction

Common in ball-and-socket joints

Wrist CircumductionPLAY

Humerus CircumductionPLAY

Figure 6.13d

Special Movements

Dorsiflexion

Lifting the foot so that the superior surface approaches the shin

Plantar flexion

Depressing the foot (pointing the toes)

Special Movements

Figure 6.13e

Ankle Dorsiflexion/Plantar FlexionPLAY

Special Movements

Inversion

Turn sole of foot medially

Eversion

Turn sole of foot laterally

Special Movements

Ankle Inversion/EversionPLAYFigure 6.13f

Special Movements

Supination

Forearm rotates laterally so palm faces anteriorly

Pronation

Forearm rotates medially so palm faces posteriorly

Special Movements

Figure 6.13g

Elbow Pronation/SupinationPLAY

Special Movements

Opposition

Move thumb to touch the tips of other fingers on the same hand

Special Movements

Hand OppositionPLAYFigure 6.13h

Types of Muscles

Prime mover—muscle with the major responsibility for a certain movement

Antagonist—muscle that opposes or reverses a prime mover

Synergist—muscle that aids a prime mover in a movement and helps prevent rotation

Fixator—stabilizes the origin of a prime mover

Naming Skeletal Muscles

By direction of muscle fibers

Example: Rectus (straight)

By relative size of the muscle

Example: Maximus (largest)

By location of the muscle

Example: Temporalis (temporal bone)

By number of origins

Example: Triceps (three heads)

By location of the muscle’s origin and insertion

Example: Sterno (on the sternum)

By shape of the muscle

Example: Deltoid (triangular)

By action of the muscle

Example: Flexor and extensor (flexes or extends a bone)

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

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

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

Figure 6.16b

Posterior muscles

Trapezius—elevates, depresses, adducts, and stabilizes the scapula

Latissimus dorsi—extends and adducts the humerus

Deltoid—arm abduction

Muscles of Posterior Neck, Trunk, Arm

Figure 6.17a

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)

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

Figure 6.19c

Muscles causing movement at the knee joint

Hamstring group—thigh extension and knee flexion

Biceps femoris

Semimembranosus

Semitendinosus

Figure 6.19a

Muscles causing movement at the knee joint

Sartorius—flexes the thigh

Quadriceps group—extends the knee

Rectus femoris

Vastus muscles (three)

Figure 6.19c

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

Intramuscular Injection Sites

Figure 6.18, 6.19b, d

CVA A&P - Chapter 6c: Muscle Movements and Major Muscles

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