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Muscular System Skeletal Muscles and associated connective tissue –Skeletal muscle cells=muscle fibers FUNCTIONS Produces movement –(through contraction.

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Presentation on theme: "Muscular System Skeletal Muscles and associated connective tissue –Skeletal muscle cells=muscle fibers FUNCTIONS Produces movement –(through contraction."— Presentation transcript:

1 Muscular System Skeletal Muscles and associated connective tissue –Skeletal muscle cells=muscle fibers FUNCTIONS Produces movement –(through contraction of cells) Stabilizes joints and maintains posture (through contraction of cells) Communication –(through contraction of cells) –Enhances interpersonal communication through facial expression Produces body heat –(through high levels of cellular respiration)

2 Figure 10.2

3 Figure 10.1

4 Figure 10.3

5 Table 10.2

6 Dark Light striations

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9 Figure 10.8

10 Figure 10.9

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12 Figure 10.9: Summary of events initiating and causing contraction

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15 Motor Unit: A motor neuron and all the muscle fibers it innervates

16 Figure 10.10

17 Figure showing deep fascial compartments

18 Figure showing deep fascial compartments

19 Figure showing deep fascial compartments

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21 Trauma/infection  inflammation/swelling + confined space/compartment  build up of pressure a.Pressure on nerves  pain & tenderness b.Compression/obstruction of blood vessels  disrupts blood flow Tissue death (infarction/necrosis) T he following slide has an image of a fasciotomy performed to relieve pressure within an inflamed fascial compartment and diagrams used in lecture to explain the similar basis of carple tunnel syndrome Prolonged compromised blood flow

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25 Following slides are descriptions of motor innervations of selected nerves

26 Motor Cortex: Frontal Lobe  Controls conscious/volunatary muscle activity

27 Figure 15.11

28 Figure Somatomotor homunculus -- on precentral gyrus -- primary somatomotor cortex

29 Frontal Lobe Primary Somatic Motor Center: –Precentral gyrus /primary motor cortex: –Origin of motor neurons to specific muscles –Contralateral –Contains the motor homunculus, a ‘motor map’ of the body Premotor area: anterior to primary motor cortex. –Motor functions organized before initiation of activity –Including frontal eye field for eye movement Broca's area: motor speech- muscle to vocalize Frontal lobe and motor control is contralateral: e.g., the right frontral lobe controls movement on the left side of the body

30 Motor innervations for selected Cranial Nerves V, VII, & XI

31 Trigeminal Nerve (V) Motor Innervation: –Muscles of mastication (and some of palate and throat) –Through: Foramen ovale Foramen rotundum Superior orbital fissure

32 Facial Nerve (VII) Motor: –Muscles of facial expression –(and some throat muscles) –Bell ’ s (Facial) Palsy –Some branches pass through internal acoustic meatus and stylomastoid foramen

33 Accessory Nerve (XI) / a.k.a. spinal accessory nerve Motor: –Sternocleidomastoid and trapezius –Some pharynx muscles –Passes through the jugular foramen

34 Radial Nerve: Course: Through axilla, then deep along posterior humerus then along radius Motor innervation: All upper limb extensor muscles + brachioradialis and supinator Factoid: Wrist drop (crutch paralysis): constant pressure on/in axillary or region or other pressure on nerve can cause damage to nerve preventing wrist extensors from working resulting in “ drop ” of wrist.

35 Median Nerve: Course Along medial, anterior humerus, across antecubital region (i.e., elbow pit) into wrist Motor Innervation: Pronators, flexors of wrist and digits & most thumb muscles Flex carp rad and deep muscle Does not innervate brachiorad. Factoid: Involved with Carple tunnel Syndrome

36 Ulnar Nerve Course: runs on medial arm and forearm (along ulna) Motor: Some wrist flexors (flexor carpi ulnaris) and intrinsic digit flexors And most digit ab/adductors Factoid: Association w/ “ funny bone ”

37 Femoral Nerve Course, from lumbar region/plexus across front of iliacus muscle and over the top/front of pubic bone Motor: iliopsoas, pectineus, quadriceps group, & sartorius –Flexion of thigh and/or extension of knee

38 Sciatic nerve = tibial nerve + common fibular nerve Posterior view anterior view

39 Tibial (sciatic) Nerve Course : from sacral plexus, through greater sciatic notch to pass behind the pubis and enter posterior thigh and leg and most of foot Motor: Posterior thigh ( hamstrings) and posterior leg muscles; muscles (those that plantar flex foot and flex toes) flexors

40 Common Fibular (sciatic) Nerve Course: Separates from tibial in popliteal fossa (knee pit) and innervates anterior and lateral leg and foot Motor: Anterior and lateral leg muscles and to extensors of toes


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