BIO201 - Ch 10 - Muscular System Shoulder&Arm - Marieb/Hoehn - Rio Salado - AZ
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| Extrinsic muscles of posterior thorax include? | Latissimus dorsi, trapezius muscles, rhomboids, & levator scapulae.
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| The clavicles rotate around __ to provide stability & precision to scapular movements. | Their own axes.
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| The important movements of the pectoral girdle involve __. | Displacements of the scapula - elevation/depression rotation & lateral/medial movements.
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| Most scapular movements are promoted by? | The serratus anterior muscles & posterior muscles.
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| Muscles originating posterior to shoulder joint __ the arm. | Extend
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| The latissimus dorsi & posterior fibers of deltoid muscles are the __ of arm extension. | Prime movers
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| The latissimus dorsi & pectoralis muscles are __ of one another in the flexion-extension movements of arm. | Antagonists
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| The rotator cuff muscles act as __ in the angular & rotational movements of the arm. | Synergists
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| The main function of rot. cuff muscles is to __. | Reinforce capsule of shoulder joint to prevent dislocation of the humerus.
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| Muscles that originate anterior to shoulder joint __ the arm. | Flex
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| Prime mover of arm flexion is the __. | Pectoralis major
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| Name the prime mover of arm abduction. | Deltoid muscle - active during swinging movements during walking - N=axillary nerve
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| Name the main adductors of arm. | Pectoralis major & latissimus dorsi
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| All muscles acting on the humerus originate from the __. | Pectoral girdle
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| Muscles originating __ to shoulder joint extend the arm. | Posterior
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| To paddle a canoe, which muscle acts with the trapezius to "square the shoulders?" | Rhomboids
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| __ muscles cross each sholder joint to insert on the humerus. | 9
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| Name 3 prime movers of arm movements. | Pectoralis major, latissimus dorsi, & deltoid.
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| Name the 4 rotator cuff muscles. | Supraspinatus, infraspinatus, teres minor, & subscapularis.
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| The rotator cuff muscles originate on the __. | Scapula
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| The arrangement of muscle attachments to scapula is that __. | One muscle cannot bring about simple (linear) movements of its own. Several muscles must act in combination.
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| The prime mover of shoulder elevation are __. | The trapezius & levator scapulae.
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| Pushing or punching movements (abduction) of scapula reflects __ activity. "Boxers muscle". | Serratus anterior.
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| Which muscles shrug the shoulders? | The Trapezius.
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| Prime movers of arm extension are? | Latissimus dorsi & deltoid.
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| Walls of fascia divide the arm into what 2 muscle compartments? | Posterior extensors & anterior flexors.
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| Prime mover of forearm extensiors? | Triceps brachii
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| All anterior arm muscles cause elbow __. | Flexion
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| Forearm muscles are functionally divided into 2 groups. | Those causing wrist movements & those moving fingers & thumb.
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| Flexor & extensor retinacula | Strong ligaments/"wrist bands" that keep tendons from jumping outward when tensed.
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| Most flexors in the anterior compartment of forearm arise from a common tendon on the __ & innervated by __. | Humerus - Median nerve
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| Name the 2 pronators of the forearm. | Pronator teres & pronator quadratus.
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| Which muscle assists biceps brachii in supinating the forearm? | Supinator
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| All posterior forearm muscles supplied by __ nerve. | Radial
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| Most muscles that move the hand are located __. | In the forearm & "operate" the fingers via long tendons.
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| Intrinsic muscles of the hand allow for? | Fine movements of the fingers.
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| All intrinsic muscles lie in the __. | Palm & none on hands' dorsal side.
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| The thumb flexes by bending __. | Medially, not anteriorly like other fingers.
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| 3 groups of intrinsic muscles of the palm. | (1)thenar eminence (ball of thumb), (2)hypothenar eminence (ball of little finger), & (3) midpalm.
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| The midpalmar muscles do what? | Extend our fingers at the interphalangeal joints.
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| The main finger abductors & adductors. | Interossei
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