The muscular system I Muscles of the head neck and trunk
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1 The muscular system I Muscles of the head neck and trunk Dr. Nabil Khouri Dr. Nabil Khouri MD MSc, PhD
2 Interactions of Skeletal Muscles Skeletal muscles work together or in opposition Muscles only pull (never push) All muscles have an Origin and Insertion Origin of a muscle is close to body center Insertion is far from body center. As muscles shorten, the insertion generally moves toward the origin Whatever a muscle (or group of muscles) does, another muscle (or group) undoes
3 Muscle Classification: Functional Groups Prime movers provide the major force for producing a specific movement Antagonists oppose or reverse a particular movement Synergists Add force to a movement Reduce undesirable or unnecessary movement Fixators synergists that immobilize a bone or muscle s origin
4 Naming Skeletal Muscles Location of muscle bone or body region associated with the muscle Shape of muscle e.g., the deltoid muscle (deltoid = triangle) Relative size e.g., maximus (largest), minimus (smallest), longus (long) Direction of fibers e.g., rectus (fibers run straight), transversus, and oblique (fibers run at angles to an imaginary defined axis)
5 Naming Skeletal Muscles Number of origins e.g., biceps (two origins) and triceps (three origins) Location of attachments named according to point of origin or insertion Action e.g., flexor or extensor, as in the names of muscles that flex or extend, respectively
6 Arrangement of Fascicles Parallel fascicles run parallel to the long axis of the muscle (e.g., sartorius) Fusiform spindleshaped muscles (e.g., biceps brachii)
7 Arrangement of Fascicles Pennate short fascicles that attach obliquely to a central tendon running the length of the muscle (e.g., rectus femoris) Convergent fascicles converge from a broad origin to a single tendon insertion (e.g., pectoralis major)
8 Arrangement of Fascicles Circular fascicles are arranged in concentric rings (e.g., orbicularis oris)
9 Bone-Muscle Relationships: The Lever Systems Lever a rigid bar that moves on a fulcrum, or fixed point Effort force applied to a lever Load resistance moved by the effort
10 Lever Systems: Classes
11 First class the fulcrum is between the load and the effort
12 Lever Systems: Second class lever Figure 10.3b
13 Third class lever
14 Third class lever: the effort is applied between the fulcrum and the load Figure 10.3c
15 Axial Muscles Muscles of the head and Neck Thoracic wall Abdominal wall Diaphragm Muscles of the trunk: Back Appendicular muscles Muscles of the upper limb Muscles of the lower limb
16 Muscles of the head and neck Dr. Nabil Khouri MD MSc, PhD
17 Muscles of the Scalp Occipito-frontalis Epicranius (occipitofrontalis) this muscle consists of two: The Frontalis The Occipitalis Galea aponeurotica cranial aponeurosis connecting the two muscles These two muscles have alternate actions of pulling the scalp forward and backward Dr. Nabil Khouri MD MsC, PhD
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19 Muscles of the Face 11 muscles are involved in lifting the eyebrows, flaring the nostrils, opening and closing the eyes and mouth, and smiling All are innervated by cranial nerve VII (facial nerve) Usually insert in skin (rather than bone), and adjacent muscles often fuse Dr. Nabil Khouri MD MsC, PhD
20 Muscles of facial expression: Change shape of eyes and mouth Innervated by the 7 th cranial nerve (facial nerve) Bell,s palsy Examples: Orbicularis oris muscle Orbicularis oculi muscle Frontalis muscle Zygomatic muscle Buccinator muscle
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22 Dr. Nabil Khouri MD MsC, PhD
23 Muscles of mastication: Move the mandible (insertion): open and close (chewing) Innervation by the 5 th cranial nerve (trigeminal nerve) Masseter muscle: closes Temporalis muscle: closes Lateral Pterygoid muscle: opens
24 Muscles of Mastication
25 Muscles Of mastication
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27 Platysma muscle Origin : from deep fascia of pect. Major M Insertion lower mandible margin Muscles of mouth angle Anterior fibers cross to the opposite side
28 Muscles of the neck Sternocleidomastoid muscle Suprahyoid muscles Infrahyoid muscles Scalene muscles
29 Muscles of the Neck Dr. Nabil Khouri MD MSc, PhD
30 Muscles of the Anterior Neck : Supra-hyoid These deep throat muscles form the floor of the oral cavity, anchor the tongue, elevate the hyoid, and move the larynx superiorly during swallowing For full discribtion regarding the origin and insetion and action of this groups of muscle: Muscles-of-the-Neck-Muscles-of-the-Thoracic Dr. Nabil Khouri MD MsC, PhD
31 Muscles of the Anterior Neck: Supra-hyoid Supra-hyoid
32 Muscles of the Anterior Neck : infra-hyoid infra-hyoid Dr. Nabil Khouri MD MSc, PhD
33 Muscles of the Neck: Head Movements Major head flexor is the sternocleidomastoid muscle Synergists to head flexion are the suprahyoid and infrahyoid Lateral head movements are accomplished by the sternocleidomastoid and the scalene muscles Head extension is accomplished by the deep splenius muscles and aided by the superficial trapezius Dr. Nabil Khouri MD MsC, PhD
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35 Muscles of the Neck: Head Movements Dr. Nabil Khouri MD MsC, PhD
36 Muscles of the Trunk Thoracic wall Muscles: Intercostal muscles Diaphragm Abdominal wall muscles
37 Muscles of the Thorax: Respiratory muscles Internal intercostals deeper layer that aids in forced expiration The primary function of deep thoracic muscles is to promote movement for breathing External intercostals more superficial layer that lifts the rib cage and increases thoracic volume to allow inspiration
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39 Muscles of the Thorax: Resp. Muscles Diaphragm most important muscle in inspiration
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41 Muscles of the Abdominal Wall
42 Muscles of the Abdominal Wall
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45 Muscles of the back
46 Stabilization of the Scapulae Elevators Trapezius (upper) Levator scapulae Rotators Rhomboid minor Rhomboid major Serratus anterior Depressors Trapezius (lower) Pectoralis minor (next slide)
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48 Latissimus dorsi
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50
51
52 Teres major
53 Trunk Movements: Deep Back Muscles The prime mover of back extension is the erector spinae Erector spinae, or sacrospinalis, muscles consist of three columns on each side of the vertebrae iliocostalis, longissimus, and spinalis Lateral bending of the back is accomplished by unilateral contraction of these muscles Other deep back extensors include the semispinalis muscles and the quadratus lumborum
54 Trunk Movements: Deep Back Muscles
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