muscular system skeletal muscles and associated connective tissue –skeletal muscle cells=muscle...
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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)
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Figure 10.2
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Figure 10.1
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Figure 10.3
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Table 10.2
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Dark DarkLightLight
striations
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Figure 10.8
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Figure 10.9
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Figure 10.9:
Summary of events initiating and causing contraction
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Motor Unit:A motor neuron and all the muscle fibers it innervates
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Figure 10.10
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Figure 12.10 showing deep fascial compartments
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Figure 12.16 showing deep fascial compartments
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Figure 12.19 showing deep fascial compartments
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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)
The 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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Following slides are descriptions of motor innervations of selected nerves
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Motor Cortex: Frontal LobeControls conscious/volunatary muscle activity
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Figure 15.11
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Figure 15.12
Somatomotor homunculus -- on precentral gyrus -- primary somatomotor cortex
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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
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Motor innervations for selected Cranial Nerves V, VII, & XI
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Trigeminal Nerve (V)
• Motor Innervation:– Muscles of mastication
(and some of palate and throat)
– Through: • Foramen ovale• Foramen rotundum• Superior orbital fissure
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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
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Accessory Nerve (XI) / a.k.a. spinal accessory nerve
• Motor:– Sternocleidomastoi
d and trapezius– Some pharynx muscles
– Passes through the jugular foramen
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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.
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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
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Ulnar NerveCourse: • 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”
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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
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Sciatic nerve = tibial nerve + common fibular nerve
Posterior view
anterior view
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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
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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