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You are watching: Muscles are only able to pull they never push

1 Muscle Info… general Info: -Muscles always pull and never push bones…***Meaning during a joints movement phase muscles leading to the movement can only pull the bones toward each other…they cannot push the bones towards each other. Example: -Elbow flexion *Muscle responsible is the biceps brachii (prime mover). *Pulls insertion towards beginning radial tuberosity towards the coracoid procedure Triceps Brachii (antagonist): -This muscle does not “push” the share open during muscle contraction… in this instance it does allow the activity to occur…

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2 Muscle Movements… Muscle Movements:Prime mover – Muscle with the significant responsibility for a particular movement Antagonist – Muscle that opposes or reverses the action of a element mover Synergist – Muscle the aids a prime mover in a activity ***Synergists do a similar movement to the element mover, yet to a lesser level ***Synergists also help reduce undesirable movements… (muscles the stabilize the wrist throughout elbow flexion) Fixator muscles – Stabilizes one part of the body during the motion of one more ***Specifically stabilizes the beginning bone throughout movement. ***Examples would certainly be the erector spinea team of muscles that keep you upright throughout movement

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3 Naming Muscles… 1) Direction of the Muscle Fibers:- named in referral to one imaginary line (usually the midline of the body) *** Example: 1) Rectus way “Straight” - Rectus Femoris = muscle fibers of the thigh run parallel to that imaginary heat 2) Obliques means neither parallel no one perpendicular to the long axis that a human body or body - exterior Obliques = muscle fibers operation at one “angle” come the midline

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4 Naming Muscles… 2. Relative Size that the Muscle Maximus = largestMinimus = the smallest Longus = longest *** Example: 1) Gluteus Maximus: - biggest of the gluteal muscle (medius / minimus) 2) Gluteus Minimus: - largest of the gluteal muscles 3) Extensor Pollicus Longus: - Longest of the extensor muscle of the posterior lower arm.

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5 Naming Muscles… 3. Location of the MuscleNamed for the bone through the muscles are associated . *** Example: Temporalis = Overlies the temporal bone of the skull Femoris = Overlies the femur Anterior Tibialis= Overlies the anterior portion of the tibia Sternocliedomastoid= Overlies the sternum, clavicle and also mastoid processes 4. Variety of Origins Name based on the variety of attachment sites (heads) the it has actually with bones *** Example: Biceps = two origins Triceps = three origins Quadriceps = 4 origins

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6 Naming Muscles… 5. Ar of the Muscle’s Origin and InsertionNamed for your attachment sites come bones. *** Example: Sternocleidomastoid  origin on sternum (Sterno—) and Clavicle (—cleido—)  Insertion ~ above mastoid procedure of temporal bone (—mastoid) 6. Form of the Muscle named for the distinctive shape that part muscles have. *** Example: Deltoid: Deltoid way “triangular” Rhomboideus Minor: Rhomboid shaped muscle “A four-sided shape where every sides have actually equal length, likewise opposite sides are parallel and also opposite angles room equal.

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(found deep come tapezium, which would be another great exmaple)

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7 Naming Muscles… 7. Action of the MuscleNamed for actions such as flexion, extension, adduction and abduction… *** Example: Adductor Longus= adducts the femur Extensor Digitorum Longus = extends the finger (found on posterior forearm area) Extensor Digitorum Longus: = extend the fingers (found ~ above posterior forearm area)

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