Questions and Answers
What is the primary action of the pectoralis major muscle?
Which muscle originates from the lower eight ribs?
The primary action of the biceps brachii is to:
What is the insertion point of the deltoid muscle?
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What action is performed by the rectus abdominis?
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What is the primary action of the frontalis muscle?
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Which muscle is responsible for flexing the neck and laterally rotating the head?
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In which fascicle arrangement are muscle fibers oriented parallel to the long axis of the muscle?
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What criterion is used in the naming of muscles when considering their shape?
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Which muscle closes the jaw and is located in the temporal bone?
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What is the primary action of the orbicularis oris muscle?
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What type of fascicle arrangement has a central tendon with short fibers attaching to it obliquely?
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Which muscle compresses the cheek and holds food between the teeth while chewing?
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Which muscle primarily functions to abduct the arm at the shoulder joint?
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Which of the following muscles is NOT part of the pectoral girdle?
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What is the primary action of the rotator cuff muscles?
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Which muscle is responsible for the medial rotation of the arm?
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Which joint is primarily involved in movements facilitated by the muscles acting on the humerus?
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What muscle group is primarily responsible for flexing the hip?
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Which of the following actions is performed by the quadriceps group?
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What is the origin of the Sartorius muscle?
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Which muscle is responsible for dorsiflexing and inverting the foot?
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Which of the following is NOT a primary action of the adductor muscles?
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What is the insertion point for the Tibialis anterior muscle?
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Which muscle group includes the vastus medialis, intermedius, and lateralis?
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What action do the fibularis muscles primarily perform?
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What is the primary action of the trapezius muscle?
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Which muscle is responsible for fixing the cranial aponeurosis and pulling the scalp posteriorly?
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Which of the following muscles extends and adducts the humerus?
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What is the origin of the deltoid muscle?
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The erector spinae muscle is primarily involved in which action?
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What muscle functions to flex the spine laterally and extend the spine?
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Which muscle is located on the lower spine and the iliac crest?
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Which muscle is characterized by its role in abducting the humerus?
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Study Notes
Naming Skeletal Muscles
- Muscles are named based on origin and insertion, shape, and action.
- Origin and Insertion: Example includes "sternocleidomastoid," indicating its attachment to the sternum.
- Shape: Example includes "deltoid," which means triangular.
- Action: Examples include “flexor” and “extensor,” denoting muscles that flex or extend a limb.
Arrangement of Fascicles
- Circular: Fascicles arranged in concentric rings.
- Convergent: Fascicles converge on a single insertion tendon.
- Parallel: Fascicles run parallel to the long axis of the muscle.
- Fusiform: Spindle-shaped muscle resulting from modified parallel arrangement.
- Pennate: Short fascicles attach at an angle to a central tendon.
Superficial Anterior Muscles of the Body: Head/Neck
- Frontalis: Originates from cranial aponeurosis; raises eyebrows.
- Orbicularis oculi: Originates from frontal bone and maxilla; blinks and closes the eye.
- Zygomaticus: Originates from zygomatic bone; raises corners of the mouth.
- Temporalis and Masseter: Both close the jaw; originate from temporal bone.
Superficial Anterior Muscles of the Body: Trunk
- Pectoralis major: Originates from sternum, clavicle, and ribs; adducts and flexes the humerus.
- Rectus abdominis: Originates from pubis; flexes the vertebral column.
- External oblique: Originates from lower eight ribs; flexes and rotates the vertebral column.
Superficial Anterior Muscles of the Body: Arm/Shoulder
- Biceps brachii: Originates from scapula; flexes elbow and supinates the forearm.
- Brachialis: Originates from distal humerus; also flexes elbow.
Superficial Anterior Muscles of the Body: Hip/Thigh/Leg
- Iliopsoas: Originates from ilium and lumbar vertebrae; flexes the hip.
- Adductor muscles: Originate from pelvis; adduct and medially rotate the thigh.
- Quadriceps group: All extend the knee; rectus femoris also flexes hip.
Superficial Posterior Muscles of the Body: Head/Neck/Trunk/Shoulder
- Occipitalis: Originates from occipital and temporal bones; fixes aponeurosis and pulls scalp backward.
- Trapezius: Originates from occipital bone and vertebrae; raises, retracts, and rotates the scapula.
- Latissimus dorsi: Originates from lower spine and iliac crest; extends and adducts the humerus.
Additional Muscles
- Erector spinae: Extends and laterally flexes the spine; originates from iliac crests and ribs.
- Deltoid: Abducts the humerus; originates from scapular spine and clavicle.
These details provide an overview of the skeletal muscles, their naming conventions, fascicle arrangements, and specific muscle functions, targeting students studying human anatomy.
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Description
This quiz tests your knowledge on the criteria for naming skeletal muscles, including their location, shape, and action. Understand how these factors contribute to the terminology used in anatomy. Perfect for students studying human anatomy and physiology.
