Presentation is loading. Please wait.

Presentation is loading. Please wait.

Muscles. What you Need to Know Look briefly at the Structure of: 1) Skeletal, 2) Smooth & 3) Cardiac Muscle Naming, Identification, Functions You are.

Similar presentations


Presentation on theme: "Muscles. What you Need to Know Look briefly at the Structure of: 1) Skeletal, 2) Smooth & 3) Cardiac Muscle Naming, Identification, Functions You are."— Presentation transcript:

1 Muscles

2 What you Need to Know Look briefly at the Structure of: 1) Skeletal, 2) Smooth & 3) Cardiac Muscle Naming, Identification, Functions You are only responsible for the identification of ALL muscles which are on your Lab Packet In general: Generates force to move your bones Propel body fluids & ingested food Generate and distribute heat

3 Muscle Specialized for contraction  movement of skeleton or internal organs a) skeletal c) smooth b) cardiac

4 Skeletal Muscle -generally attaches to bone  causes movement of skeleton -voluntary (conscious control) Characteristics: -long & unbranched, tightly packed, parallel cells -multinucleated -striated (striped)

5 Cardiac Muscle -muscle of the heart -1 nucleus per cell Characteristics: -branched cells with mild striations -involuntary (not consciously controlled)

6 Smooth Muscle -movement within internal organs other than the heart (e.g. digestive tract, bladder, arteries, etc.) -involuntary Characteristics: -tapered cells -single nucleus/cell -no striations

7 Observe muscle slides! Use these pictures to quiz yourself!

8 Dense Regular Connective Tissue -fibroblasts in collagen matrix Fibroblasts Collagen fibers -forms tendons (attach muscle to bone) and ligaments (attach bone to bone)

9 Facial Muscles Frontalis: raises eyebrows; wrinkles forehead Orbicularis oculi: closes eye Orbicularis oris: closes and purses lips Temporalis: elevates mandible Buccinator: compresses cheek Masseter: elevates mandible (closes jaw) p. 84

10 Facial Muscles Frontalis: raises eyebrows; wrinkles forehead Orbicularis oculi: closes eye Orbicularis oris: closes and purses lips Temporalis: elevates mandible Buccinator: compresses cheek Masseter: elevates mandible (closes jaw) No equivalent picture in lab manual

11 Sternocleidomastoid -If both contracted  flexion of head when both (nod down) -If one contracted  rotates head to opposite shoulder

12 Muscles Many muscles form antagonistic muscle pairs Agonist: muscle that’s causing movement Antagonist: muscle that opposes the agonist During arm flexion: Agonist: Antagonist: Biceps brachii Triceps brachii During arm extension: Agonist: Antagonist: Triceps brachii Biceps brachii An example…

13 Muscles that Move Shoulder Trapezius: elevates (i.e. raises shoulders) & retracts scapula (i.e. pulls shoulders back) Retracts scapula Elevates scapula

14 Muscles that Move Shoulder Pectoralis minor: draws scapula forward & downward (i.e. pulls shoulders down and forward) Draws scapula forward Draws scapula downward No pic in lab manual

15 Muscles that Move Shoulder Serratus anterior: draws scapula forward (i.e. pulls shoulder forward) Draws scapula forward Serratus anterior p. 82, 85

16 Pectoralis major: flexes (moves arm up and forward) & adducts upper arm (moves arm toward the body) Muscles that Move the Upper Arm Flexes upper arm Adducts upper arm

17 Muscles that Move the Upper Arm Latissimus dorsi: extends (i.e. moves arm down to the rear) & adducts arm (moves arm toward body) Extends upper arm Adducts upper arm

18 Deltoid Muscles that Move Upper Arm Deltoid: abducts arm (raises arm up away from the side) Abducts arm

19 Moving the Forearm Brachialis Biceps brachii: flexes forearm Biceps brachii Brachialis: flexes forearm Biceps brachii Brachialis Flexion of forearm

20 Muscles that Move the Forearm Triceps brachii: extends the forearm extension p. 83, 85

21 Flexors & Extensors of Hand Hand flexor group: flex the hand Hand extensor group: extend the hand p , 85 p

22 Muscles of Abdominal Wall – Movement of Spine Rectus abdominus: flexes vertebral column p. 82

23 Muscles of Abdominal –Moving the spine Trunk Rotation Compressing abdomen External oblique: compresses abdomen; rotates trunk; lateral flexion Internal oblique: compresses abdomen; trunk rotation; lateral flexion Transversus abdominis: compresses abdomen Lateral flexion No pic

24 Muscles of Chest Wall –Movement of Ribs External intercostals: elevates rib cage during inspiration Internal intercostals: depresses rib cage during forced expiration Diaphragm: prime mover during inspiration; increases vertical dimension of thorax No pics

25 Muscles of Chest Wall –Movement of Ribs Internal intercostal External intercostal

26 Muscles that Move the Thigh Gluteus maximus: extends thigh p. 83, 86

27 Muscles that Move the Thigh iliopsoas: flexion of thigh Flexion of thigh

28 Muscles that Move the Thigh Flexion of thigh Abducts of thigh Tensor fascia latae: flexes & abducts thigh

29 Adductor group: adducts and flexes thigh Flexion of thigh Adducts of thigh Muscles that Move the Thigh

30 sartorius: flexes & laterally rotates thigh; helps you sit cross-legged Lateral rotation & flexion of thigh

31 Muscles that Move the Thigh Quadriceps femoris group: extends knee Rectus femoris: extends knees and flexes thigh Knee extension Flexion of thigh

32 Muscles that Move the Lower Leg Hamstring group: extends thigh & flexes knee Extension of thigh Knee flexion

33 Muscles that Move the Foot Tibialis anterior: dorisflexes foot Gastrocnemius: plantar flexes foot, flexes knee Soleus: plantar flexes foot

34 Today’s Activities Muscles: Gross Anatomy Use the models and diagrams in you textbook & lab manual to study locations & actions of the muscles listed on pp  Diagrams in textbook = right side; most models = left side Muscles: Tissue & Histology Examine the following slides using the microscope: 1) Skeletal muscle DO NOT leave until you have been excused, or you will be marked absent!!! 2) Smooth muscle 3) Cardiac muscle 4) Dense regular connective tissue  Don’t worry about extra muscles described in textbook  Don’t worry about extra actions described in textbook Answer questions, fill out diagrams on pp If you get done early, you can go back to the bones, etc.

35

36 Medial View Medial View-Deep flexors Lateral View Lateral View-Deep extensors Radial view Lateral View-Deep shoulder extensors

37 Anterior View Lateral ViewMedial View Posterior View Plantar surface

38 Search “MuscleandMotion” on YouTube

39

40


Download ppt "Muscles. What you Need to Know Look briefly at the Structure of: 1) Skeletal, 2) Smooth & 3) Cardiac Muscle Naming, Identification, Functions You are."

Similar presentations


Ads by Google