Organization of Skeletal Muscle 24a A&P: Muscular System - - - PowerPoint PPT Presentation

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Organization of Skeletal Muscle 24a A&P: Muscular System - - - PowerPoint PPT Presentation

Feb 19, 2024 34 likes •625 views

24a A&P: Muscular System- Organization of Skeletal Muscle 24a A&P: Muscular System - Organization of Skeletal Muscle Class Outline 5 minutes Attendance, Breath of Arrival, and Reminders 10 minutes Lecture:

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24a A&P: Muscular System- Organization of Skeletal Muscle

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24a A&P: Muscular System - Organization of Skeletal Muscle Class Outline

5 minutes Attendance, Breath of Arrival, and Reminders 10 minutes Lecture: 25 minutes Lecture: 15 minutes Active study skills: 60 minutes Total

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24a A&P: Muscular System - Organization of Skeletal Muscle Class Reminders

Quizzes:

  • 29b Kinesiology Quiz

– Supraspinatus, infraspinatus, teres major, subscapularis, pec minor, & serratus anterior

  • 31a Written Exam Prep Quiz (20a, 20b, 21b, 22a, 23a, 24b, 29b, and 30a)
  • 32a Written Exam Prep Quiz (24a, 25a, 26a, 27a, 28a, 29a, 30b, and 31b)

Assignments:

  • 30a Review Questions

– Packet A: 123-140 Preparation for upcoming classes:

  • 25a A&P: Muscular System: Mechanism of Contraction

– Trail Guide: subscapularis – Salvo: Pages 436-437 – Packet E: 39-42 – Packet A-132

  • 24b Hydrotherapy: Dry Brushing, Cold Water Wash, and Foot Treatment

– Packet G: 15-19

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Classroom Rules

Punctuality - everybody’s time is precious

  • Be ready to learn at the start of class; we’ll have you out of here on time
  • Tardiness: arriving late, returning late after breaks, leaving during class, leaving

early The following are not allowed:

  • Bare feet
  • Side talking
  • Lying down
  • Inappropriate clothing
  • Food or drink except water
  • Phones that are visible in the classroom, bathrooms, or internship

You will receive one verbal warning, then you’ll have to leave the room.

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Rotator Cuff

Trail Guide, Page 74 Supraspinatus S Infraspinatus I Teres Minor T Subscapularis S

Posterior View

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Rotator Cuff

Trail Guide, Page 74

Supraspinatus

  • Teres Minor
  • Infraspinatus
  • Subscapularis
  • Posterior View
  • Posterior View
  • Posterior View
  • Anterior View
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Infraspinatus and Teres Minor

Trail Guide, Page 75

Infraspinatus is located in the infraspinous fossa, with its medial portion deep to the trapezius fibers. Teres minor is a small muscle squeezed between infraspinatus and teres major. What do you use infraspinatus and teres minor for?

Posterior View

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O A I

Posterior View

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O A I

Posterior View

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O A I

Posterior View

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O A I

Posterior View

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O A I

Posterior View

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Shift gears from Infraspinatus to Teres Minor

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O A I

Posterior View

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O A I

Posterior View

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O A I

Posterior View

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O A I

Posterior View

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O A I

Posterior View

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Rotator Cuff

Trail Guide, Page 74

Supraspinatus

  • Teres Minor
  • Infraspinatus
  • Subscapularis
  • Posterior View
  • Posterior View
  • Posterior View
  • Anterior View
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24a A&P: Muscular System - Organization of Skeletal Muscle E-35

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Skeletal muscles . Related fascial structures including tendons and aponeuroses.

Anatomy

Anatomy

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Movement Posture maintenance Moving substances Heat production

Physiology

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Physiology

Movement Skeletal muscle contractions produce movement of the body as a whole, called locomotion, and movement of its parts.

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Posture maintenance Skeletal muscles must contract to maintain static postures, such as in sitting and standing .

Physiology

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Physiology

Posture maintenance Skeletal muscles must contract to maintain static postures, such as in sitting and standing .

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Moving substances Contraction of skeletal muscles promotes lymphatic flow and blood flow from the extremities to the heart .

Physiology

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Moving substances Contraction of skeletal muscles promotes lymphatic flow and blood flow from the extremities to the heart .

Physiology

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Heat production (AKA: thermogenesis) Muscle contractions produce and release heat that is important for homeostasis.

Physiology

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Muscle group → skeletal muscle (organ) → fascicle → muscle fiber (cell) → myofibril → myofilament Deep fascia → epimysium → perimysium → endomysium

Myofilaments Sarcomere Myofibrils Muscle fiber Fasciculi

Organization: Muscle Cells into Muscle Organs

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Myofilaments Thick and thin protein strands within each sarcomere. Consist of actin and myosin.

Organization: Muscle Cells into Muscle Organs

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Sarcomere A muscle's contractile unit. Found within myofibrils.

Organization: Muscle Cells into Muscle Organs

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Sarcomere A muscle's contractile unit. Found within myofibrils.

Organization: Muscle Cells into Muscle Organs

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Myofibrils Thin strands within each muscle fiber. Contain myofilaments.

Organization: Muscle Cells into Muscle Organs

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Muscle fiber Thread-like muscle cell.

Organization: Muscle Cells into Muscle Organs

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Fasciculi (s. fascicle) Groups of muscle fibers or neurons.

Organization: Muscle Cells into Muscle Organs

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Endomysium Perimysium Epimysium Deep fascia Myofascial Tendon Aponeurosis Retinaculum

Connective Tissues

Connective Tissues

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Deep Fascia, Epimysium, Perimysium, Endomysium

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Endomysium Connective tissue layer that surrounds individual muscle fibers .

Connective Tissues

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Perimysium Connective tissue layer that surrounds fasciculi .

Connective Tissues

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Epimysium Connective tissue layer surrounding an entire muscle .

Connective Tissues

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Deep fascia Connective tissue layer that surrounds muscle groups .

Connective Tissues

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Superficial Fascia

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Myofascial Referring to skeletal muscles and related fascia in the muscular system.

Connective Tissues

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Tendon Cord-like structure anchoring the end of a muscle to a bone.

Connective Tissues

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Aponeurosis (p. aponeuroses) Broad, flat tendon. Attaches skeletal muscle to bone, another muscle, or skin.

Connective Tissues

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Retinaculum (p. retinacula) Bandage -like retaining bands of connective tissue found primarily around the elbows, knees, ankles, and wrists. May also act as a pulley for tendons.

Connective Tissues

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Sarcoplasm Sarcolemma Sarcoplasmic reticulum T-tubules Sarcomere

Muscle Cells

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Sarcoplasm Muscle cell cytoplasm . Sarcolemma Muscle cell membrane .

Muscle Cells

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Sarcoplasm Muscle cell cytoplasm . Sarcolemma Muscle cell membrane .

Muscle Cells

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Sarcoplasmic reticulum A fluid-filled system of sacs that store calcium.

Muscle Cells

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T-tubule Runs transversely across the sarcoplasmic reticulum, forming inward channels. Transports stored calcium ions from the sarcoplasmic reticulum into the interior of the muscle cell.

Muscle Cells

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Sarcomere A muscle's contractile unit. Found within myofibrils.

Muscle Cells

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Thin myofilaments Actin Tropomyosin Troponin Thick myofilaments Myosin

Myofilaments

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Thin myofilaments Actin Protein molecules within a muscle cell that contain binding sites

  • used during skeletal muscle contraction. Help make up thin
  • myofilaments.

Tropomyosin Protein molecule. Troponin Protein molecule.

Myofilaments

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Thick myofilaments Myosin Protein molecules within a muscle cell that attach to actin during skeletal muscle contraction. Make up the bulk of thick myofilaments.

Myofilaments

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Excitability Contractility Extensibility Elasticity

Muscle Cell Properties

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Excitability The ability to respond to a stimulus . Contractility The ability to shorten . Extensibility The ability to lengthen . Elasticity The ability to return to its original shape after movement.

Muscle Cell Properties

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24a A&P: Muscular System- Organization of Skeletal Muscle