Podcast
Questions and Answers
What is the origin of the Upper Trapezius muscle?
What is the origin of the Upper Trapezius muscle?
The action of the Middle Trapezius muscle is __________.
The action of the Middle Trapezius muscle is __________.
scapular retraction
What nerve supplies the Lower Trapezius muscle?
What nerve supplies the Lower Trapezius muscle?
Spinal accessory nerve (CN XI), C3 & C4
The Levator Scapula muscle acts to elevate and upwardly rotate the scapula.
The Levator Scapula muscle acts to elevate and upwardly rotate the scapula.
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Match the following muscles with their actions:
Match the following muscles with their actions:
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What action is performed by the Serratus Anterior muscle?
What action is performed by the Serratus Anterior muscle?
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The Pectoralis Minor muscle is responsible for scapular elevation.
The Pectoralis Minor muscle is responsible for scapular elevation.
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Which muscle is responsible for shoulder abduction?
Which muscle is responsible for shoulder abduction?
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Which muscle is responsible for scapular elevation and upward rotation?
Which muscle is responsible for scapular elevation and upward rotation?
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What is the nerve supply for the Lower Trapezius muscle?
What is the nerve supply for the Lower Trapezius muscle?
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Which muscle performs scapular retraction?
Which muscle performs scapular retraction?
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The Pectoralis Minor muscle inserts at the ______.
The Pectoralis Minor muscle inserts at the ______.
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The Serratus Anterior muscle is innervated by the Dorsal scapular nerve.
The Serratus Anterior muscle is innervated by the Dorsal scapular nerve.
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Which action is associated with the Anterior Deltoid?
Which action is associated with the Anterior Deltoid?
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The Rhomboid muscles are involved in elevation of the scapula.
The Rhomboid muscles are involved in elevation of the scapula.
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What is the origin of the Upper Trapezius muscle?
What is the origin of the Upper Trapezius muscle?
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Study Notes
Shoulder Girdle Muscles
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Upper Trapezius - Elevates and rotates the scapula upwards.
- Origin: Occipital bone, nuchal ligament, upper cervical spinous processes
- Insertion: Outer third of clavicle, acromion
- Nerve Supply: Spinal accessory (CN XI), C3 & C4 sensory component
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Middle Trapezius - Retracts the scapula
- Origin: Spinous processes of C7 through T3
- Insertion: Scapular spine
- Nerve Supply: Spinal accessory (CN XI), C3 & C4 sensory component
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Lower Trapezius - Depresses and rotates the scapula upwards
- Origin: Spinous processes of middle and lower thoracic vertebrae
- Insertion: Base of the scapular spine
- Nerve Supply: Spinal accessory (CN XI), C3 & C4 sensory component
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Levator Scapula - Elevates and rotates the scapula downwards.
- Origin: Transverse processes of the first four cervical vertebrae
- Insertion: Vertebral border of scapula between superior angle and spine
- Nerve Supply: 3rd and 4th cervical nerves and dorsal scapular nerve (C5)
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Rhomboid Muscles - Retract, elevate, and rotate the scapula downwards.
- Origin: Spinous processes of C7 through T5
- Insertion: Vertebral border of scapula between the spine and inferior angle.
- Nerve Supply: Dorsal scapular nerve (C5)
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Serratus Anterior - Protracts and rotates the scapula upwards
- Origin: Lateral surface of the eight upper ribs
- Insertion: Vertebral border of the scapula, anterior surface
- Nerve Supply: Long thoracic nerve (C5, C6, C7)
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Pectoralis Minor - Depresses, protracts, rotates the scapula downwards and tilts the scapula
- Origin: Anterior surface, 3rd through 5th ribs
- Insertion: Coracoid process of the scapula
- Nerve Supply: Medial pectoral nerve (C8, T1)
Shoulder Joint Muscles
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Anterior Deltoid - Abducts, flexes, and rotates the shoulder
- Origin: Lateral 3rd of the clavicle
- Insertion: Deltoid tuberosity
- Nerve Supply: Axillary nerve (C5, C6)
Shoulder Girdle Muscles
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Upper Trapezius: elevates and rotates the scapula upward. It originates from the occipital bone, nuchal ligament, and upper cervical spinous processes. The nerve supply is the spinal accessory nerve (CN XI) and C3 & C4 and has a sensory component.
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Middle Trapezius: retracts the scapula and is considered the prime mover. Originates from the spinous processes of C7 through T3 and is innervated by the spinal accessory nerve (CN XI) and C3 & C4 with a sensory component.
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Lower Trapezius: depresses and rotates the scapula upward. Originates from the spinous processes of middle and lower thoracic vertebrae and is innervated by the spinal accessory nerve (CN XI) and C3 & C4 with a sensory component.
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Levator Scapula: elevates and rotates the scapula downward. Originates from the transverse processes of the first four cervical vertebrae and is innervated by the 3rd and 4th cervical nerves and the dorsal scapular nerve (C5).
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Rhomboid Muscles: retract, elevate, and rotate the scapula downward. Originates from the spinous processes of C7 through T5 and is innervated by the dorsal scapular nerve (C5).
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Serratus Anterior: protracts and rotates the scapula upward. Originates from the lateral surface of the eight upper ribs and is innervated by the long thoracic nerve (C5, C6, C7).
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Pectoralis Minor: depresses, protracts, and rotates the scapula downward and tilts it. Originates from the anterior surface of the 3rd through 5th ribs and is innervated by the medial pectoral nerve (C8, T1).
Shoulder Joint Muscles
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Anterior Deltoid: abducts, flexes, and rotates the shoulder. Originates from the lateral 3rd of the clavicle, acromion, and the spine of the scapula and inserts onto the deltoid tuberosity. It is innervated by the axillary nerve (C5, C6).
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Description
This quiz covers the anatomy and function of shoulder girdle muscles, including the upper, middle, and lower trapezius, as well as the levator scapula. Understand their origins, insertions, and nerve supplies to enhance your knowledge of musculoskeletal anatomy.
