Muscle in Motion: Shoulder & Hip
Terms in this set (46)
The _____ alleviate friction during the various movements associated with the shoulder.
Strength of the shoulder joint comes from ______. All hold the head of the humerus in the glenoid cavity.
rotator cuff muscles
What are the rotator cuff muscles?
Where does the teres minor and infraspinatus originate and insert? What movement do they provide?
originate on the inferior part of the scapula and insert on the greater tubercle of the humerus; provide the movement of lateral rotation of the shoulder.
The movement of lateral rotation causes ...
the palm of hand to turn from medial to anterior position.
Where does the subscapularis originate and insert? What movement does it provide?
originates on the subscapular fossa of the scapula and inserts on the lessor tubercle of the humerus; Along with other muscle, it provides medial rotation of the shoulder.
Where does the coracobrachialis originate and insert?
originates on the coracoid process of the scapula and inserts on the middle of the medial surface of the humerus
Where does the pectoralis major originate and insert?
originates at the clavicle, sternum and ribs and inserts on the greater tubercle of the humerus.
How do the coracobrachialis and the pectoralis major muscle, move the shoulder?
They work to flex the shoulder, and also act synergistically to adduct the shoulder.
Opposing the flexor muscles are the shoulder ________, which are primarily the _____ and ______.
extensor muscles; teres major and latissimus dorsi
Where does the teres major muscles originate, and inserts?
orginates on the inferior angle of the scapula and inserts on the medial lip of the intertubercular sulcus of the humerus.
Where does the latissimus dorsi originate, and insert?
originates on the spines and bodies of vertebrae, the sacrum, the ilium and the ribs. It inserts on the medial lip of the intertubercular sulcus of the humerus
How do the teres major and latissimus dorsi muscles move the shoulder?
act synergistically to extend the shoulder.
The prime movers of shoulder adduction, the Pectoralis major and coracobrachialis, are opposed by the shoulder ______.
What are the shoulder abductors?
Supraspinatus and deltoid
Where does the deltoid muscle originate, and insert?
The deltoid muscle has three points of origin (clavicle, acromion of the scapula, and spine of the scapula) and inserts on the deltoid tuberosity of the humerus.
Where does the supraspinatus originate, and insert?
The supraspinatus originates at the supraspinous fossa of the scapula and inserts on the greater tubercle of the humerus.
How does the supraspinatus and deltoid move the shoulder?
These two muscle act to abduct the shoulder.
When all of the major muscles of the shoulder are activated, in the correct sequence, then the shoulder joint can undergo ________.
The hip (coxal) joint is a ball-and-socket synovial joint formed by ____________ of the hip bone.
the head of the femur and the acetabulum
The hip's articular capsule extends from the _____ to the _______.
rim of the acetabulum; neck of the femur
The_____ extends from the anterior inferior iliac spine of the hip bone to the intertrochanteric line of the femur.
The________ extends from the pubic part of the rim of the acetabulum to the neck of the femur.
The ______extends from the fossa of the acetabulum to the fovea capitis of the head of the femur
ligament of the head of the femur
The ______ is a fibrocartilage rim that enhances the depth of the acetabulum and decreases its diameter to less than the head of the femur.
The ______ of the acetabulum supports part of the acetabular labrum and is connected to the ligament of the head of the femur and the articular capsule.
The ________ extends from the ischial wall of the acetabulum to the neck of the femur.
The majority of the muscles that move the femur originate on ______ and insert on ____.
the pelvic girdle; the femur
What three muscles medially rotate the hip?
The gluteus minimus, gluteus medius, and the gracillis
Where does the gluteus minimus orginate and insert?
originate on the ilium and insert on the greater trochanter of the femur.
Which muscle insers on the same site as gluteus minimus so they essentially perform the same movement?
Where does the gracilis originate and insert?
It orginates on the pubis and inserts on the medial part of the tibia.
What muscle compose the small lateral rotators, which oppose medial rotators?
Piriformis, superior Gemellus, Obturator internus, inferior Gemellus, Obturator externus, and Quadratus femoris.
Where do all small lateral rotators originate and insert?
They originate on the posterior pelvic girdle and sacrum and insertion, on or near the greater trochanter of the femur
In addition to the small deep muscles, what also laterally rotates the hip?
Where does the gluteus maximus originate and inserts?
It originates on the ilium, sacrum and coccyx and inserts on the gluteal tuberosity of the femur.
The medial and lateral rotators, except the gluteus maximus, work with what other muscle, to abduct the hip?
Tensor fasciae latae
Where does the tensor faciae latae originate and insert?
Originates of the illiac crest and inserts on the iliotibial tract which continues down to lateral condyle of the tibia.
What muscle serve as hip extensors?
The gluteus maximus , hamstring muscle, and adductor magus
What muscles consist of the hamstring muscle? Where do they originate and insert?
The semimembranosus, semitendinosus, and the bicep femoris. They all originate at the ischial tuberosity and insert on the tibia.
Where does the adductor magnus originates and inserts?
On the ischial tuberosity and inserts on the linea aspera of the femur.
Besides adductor magnus, which other hip adductor originate on the pubis and insert on the linea aspera of the femur?
adductor brevis and adductor longus.
The superficial muscle, the gracilis, and the ______ contribute to the action of the larger adductor muscles.
Which muscles composes the hip flexor muscles?
Pectineus, the adductor magnus, adductor brevis, adductor longus, rectus femoris, and illiopsoas
Where does the rectus femoris originate and insert?
Originates on the iliac spine and inserts on the tibial tuberosity.
Where does the iliopsoas originate and insert?
Originates on the bodies of the lumbar vertebrae, the iliac fossa and the sacrum and inserts on the lesser trochanter of femur.
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