Question

Samplaenly Cc mple Use g Sam Sa y - Cc For the above muscle (biceps femoris, posterior view; teres minor, posterior view; sternocleisomastoid, lateral view), mark the origin and insertion of the muscle. Draw an arrow indicating line of pull. Is this muscle uniarticular, biarticular, or multiarticular? State what joint or joints the muscles crosses (you do not need to use proper name, hip joint or neck joint are fine). For each joint is spans, propose the muscle's agonist action at that joint. 8. a. b. C. he the agonist and antagonist for the following

Answer 1

Bicep femoris : The muscle has two heads a long head and a short head.

Origin: The long head originated from upper inner quadrant of posterior surface of ischial tuberosity of pelvis.

The short head originated from middle 3rd of linea aspara, lateral supracondylar ridge of femur, on posterior surface of femur

Insertio​​​n: Styloid process of head of fibula. lateral collateral ligament and lateral tibial condyle

Diagram indicating line of pull:

Biceps Femoris Hip external rotation O, Ischial tuberosity Hip extension Biceps femoris m. Short head Long head Knee flexion O, Lower half of linea aspera, lateral condyloid ridge I Lateral condyle of tibia, head of fibula External rotation of knee

Articular : it is a biarticular.

Joint crosses: it crosses hip joint and knee joint.

Muscle agonist action at that joint:

At hip joint.. Gluteus maximus..... Agonist

Bicep femoris... Synergist

Errector spine.... Synergist.

... At knee joint.. Hamstring muscle is agonist...

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Teres Minor..

The teres minor is a narrow, intrinsic shoulder muscle that extends from the lateral border of the scapula to the greater tubercle (or tuberosity) of the humerus.

Origin:at the lateral border and adjacent posterior surface of the scapula.

Insertion:Inferior facet of greater tuberosity of humerus [below infraspinatus] and capsule of shoulder joint

Diagram indicating line of pull: the arrow indicates the line of pull of teres minor

Supraspinatus Infraspinatus Scapularis- Teres minor Posterior

Articular surface:

Uni articular.. Crosses shoulder joint

Joint crosses:

Crosses shoulder joint.. The tendon of this muscle passes across, and is united with, the posterior part of the capsule of the shoulder-joint.

Muscle agonist action at that joint:

Agonist is deltoid,.. Antagonist is the latissimus dorsi. As the muscles contract across the shoulder joint it brings your shoulder upward into flexion as you push the ball the opposite happens and the antagonist becomes your deltoid and the latissimus dorsi becomes your Agonist.

Sternocleidomastoid

This muscle is one of the largest and most superficial cervical muscles.

Origin: anterior and superior manubrium and superior medial third of clavicle

Insertion: lateral aspect of mastoid process and anterior half of superior nuchal lin

Diagram indicating line of pull:

Articulation..

Multiarticular

Joint crosses: crosses cervical joints

Muscle agonist action at that joint:

Flexion [agonist] Sternocleidomastoid (Bilateral Contraction)

Extension [agonist]

-Semispinals

-Splenius Capitis

-Splenius Cervicis

-Longissimus

-Illiocostalis

-Spinalis

-Trapezius

.. Lateral Flexion- Right - Agonists

-Sternocleidomastoid

-Scalenes

-Splenius Capitis

-Splenius Cervicis

-Longus Capitis

-Longus Colli

-Illiocostalis

-Longissimus

Lateral Flexion -Left - Agonists

-Sternocleidomastoid

-Scalenes

-Splenius Capitis

-Splenius Cervicis

-Longus Capitis

-Longus Colli

-Illiocostalis

-Longissimus

A... Bicep curl.. During a biceps curl, which flexes the arm, the triceps muscle stretches as the biceps contracts. The triceps, located in the posterior compartment of the upper arm, and the biceps, in the anterior compartment, act in opposition to each other

The agonist is not always the muscle that is shortening (contracting concentrically). In a bicep curl the bicep is the agonist on the way up when it contracts concentrically, and on the way down when it contracts eccentrically. This is because it is the prime mover in both cases.

A concentric contraction is a type of muscle contraction when the length of the muscles shorten while undergoing tension

Controlled to return to neutral after bicep curl..

Bicep brachii

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