Concept explainers
To determine:
About the pectoralis minor and serratus anterior.
Introduction:
Muscles of the pectoral girdle are of two types, anterior group muscle and posterior group muscle. The anterior group contains two muscles, pectoralis minor and serratus anterior. The pectoralis minor arises from the 3-5 ribs, while, the serratus anterior arises from most of the ribs. The posterior group contains three deep muscles, the rhomboid minor, the rhomboid major, and levator scapulae.
Explanation of Solution
Pectoralis minor along with serratus anterior moves scapula laterally and forward around the chest wall. Pectoralis minor is attached to ribs 2-5 and coracoid process of scapula. It also protracts shoulder while reaching for the door handle. It also helps in picking up the suitcase by rotating the scapula and depressing the apex of the shoulders.
Serratus anterior is attached to almost all the ribs and medial border of scapula. It protracts scapula and is of prime importance in throwing, forward-reaching, and pushing actions. It also rotates scapula to elevate the apex of the shoulder, such as during lifting a suitcase. Moreover, the serratus anterior abducts the arm by fixing the scapula.
Pectoralis minor is attached to only3-5 ribs, but the serratus anterior is attached to almost all the ribs. Pectoralis minor is used in protracts shoulder, while serratus anterior protracts the scapula.
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Chapter 12 Solutions
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- The rotator cuff of the shoulder involves all of the following muscles except the: teres minor supraspinatus teres major O infraspinatus subscapularisarrow_forwardThe muscle sends a tendon deep to (though!) the bony arch of our cheek that we call the zygomatic arch. digastric masseter O temporalis mylohyoidarrow_forwardLateral rotation at the hip caused by gluteus medius and Pectineus Adductor longus Tensor fasciae latae piriformis Which of the following muscles is an antagonist to lateral rotation at the hip? Gluteus maximus Piriformis Sartorius Tensor fasciae latae Which of the following muscles is in a shortened position if a scapula is elevated Levator scapular Pectoralis minor splenius capitis Pertoralis majorarrow_forward
- Muscle located at an angle to the long axis of the body.arrow_forwardItem 24 Item 24 This thick sheet of fascia extends between the phalanges of the toes and the calcaneus, and also encloses the plantar muscles of the foot. Multiple Choice Extensor retinaculum Extensor aponeurosis nIntrinsic fascia Plantar aponeurosis Elevator tendonosisarrow_forwardBriefly explain why each of the following statements is false, or reword it to make it true. 1. Each skeletal muscle fiber is enclosed in a perimysium that separates it from adjacent fibers. 2. The orbicularis oris is a sphincter. 3. The biceps brachii is a bipennate muscle.arrow_forward
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