Concept explainers
For each of the following muscles, describe the motion(s) produced when the muscle contracts. It may be helpful to use an articulated skeleton.
a. The biceps brachii muscle attaches to the coracoid process of the scapula (one head) and to the radial tuberosity of the radius. Name two movements that the muscle accomplishes in the forearm.
b. The rectus lemons muscle attaches o the anterior inferior iliac spine and the tibial tuberosity. How does contraction move the thigh? The leg!
c. The supraspinatus muscle is located in and attached to the supra-spinatus fossa of the scapula. Its tendon runs over the head of the humerus to the greater tubercle. When it contracts, what movement occurs at the glenohumeral (shoulder) joint?
d. The gastrocnemius muscle attaches to the medical and lateral condyles of the femur and to the calcaneus. What movement at leg results when this muscle contracts? Of the foot?
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SEELEY'S ANATOMY+PHYSIOLOGY
- Which of the following statements are true of the locations and functions of muscles? (Read carefully and select all the correct statements.) A. The masseter raises the maxilla. B. The gluteus medius abducts the thigh. C. The triceps brachii flexes the forearm. D. The gastrocnemius dorsiflexes the foot. E. The orbicularis oculi opens the eye. F. The rectus abdominis extends the vertebral column. G. The sternocleidomastoids flex the head and neck. H. The quadriceps femoris group extends the thigh at the hip.arrow_forward* These muscles (and subscapularis) form the rotator cuff which is a critical stabilizing element for the glenohumeral joint (shoulder joint). Thus, one action for each of these muscles is to stabilize the shoulder joint. Examine the rotator cuff muscles in the cadaver and see if you can determine where the tendons incompletely surround the head of the humerus. What clinical significance does this have?arrow_forwardName a muscle that inserts on the scapula and plays a significant role in each of the following actions:a. pushing a stalled car,b. paddling a canoe,c. squaring the shoulders in military attention,d. lifting the shoulder to carry a heavy box on it, ande. lowering the shoulder to lift a suitcase.arrow_forward
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- Correctly identify both intact and transected (cut) muscles depicted in the diagram, using the key on the right. (Not all listed terms will be used in this exercise.) Clavicle Sternum Coracoid process Bursa Key: a. biceps brachii Bursa b. brachialis c. deltoid (cut) d. external intercostals e. external oblique f. internal oblique g.latissimus dorsi h. pectoralis major (cut) pectoralis minor j. rectus abdominis k rhomboids 1. serratus anterior m. subscapularis n. transversus abdominis 0. trapeziusarrow_forwardTo do Left hip adduction (A4) in the Frontal plane, the ( name the muscle ) would have to lie (A – Where?) relative to the joint, and since it can only (PULL ), the fibers would have to run (PERPENDICULAR) to the (D ) axis to achieve the desired movement. choose from: A. Pick from: Anterior, Posterior, Medial, Lateral, Superior, Inferior B. Write in the word “PULL” C. Write “perpendicular” D. Pick from :Anterior - posterior, Superior-inferior or Medio - Lateralarrow_forwardWhich of the following statements is true? The biceps brachii muscle has two heads that share the same origin site. O The triceps brachii muscle is contracted during elbow flexion. The biceps brachii muscle could be classified as an extensor of the forearm. None of these statements are true O The biceps brachii muscle inserts on the olecranon process of the ulna.arrow_forward
- Fundamentals of Sectional Anatomy: An Imaging App...BiologyISBN:9781133960867Author:Denise L. LazoPublisher:Cengage Learning