Muscle Flashcards
What is the attachment point of the trapezius muscle?
Attachment to the ligamentum nuchae between the external occipital protuberance and the vertebral spine, extending along the spinous processes and supraspinous ligaments of all 12 thoracic vertebrae.
Where do the upper fibers of the trapezius insert?
Into the posterior border of the lateral third of the clavicle.
What is the nerve supply of the trapezius muscle?
From the spinal part of the accessory nerve (C1-5) and branches from the cervical plexus (C3 and C4).
What action do all fibers of the trapezius help with?
Retracting the scapula.
Fill in the blank: The upper and lower fibers of the trapezius are important in scapular _______.
rotation.
What is the role of the upper fibers of the trapezius during shoulder abduction?
Elevate the acromion while lower fibers depress the medial end of the spine.
What muscle is characterized by a very wide origin and a very narrow insertion?
Latissimus dorsi.
From where does the latissimus dorsi arise?
From the spines of the lower six thoracic vertebrae, posterior layer of the lumbar fascia, and the posterior part of the crest of the ilium.
What muscle runs vertically upwards and is reinforced by slips from the lowest four ribs?
Latissimus dorsi.
True or False: The lateral border of the latissimus dorsi forms a boundary of the lumbar triangle.
True.
What is the function of the upper fibers of the trapezius in relation to the neck?
Can produce lateral flexion of the neck and extend the neck when acting with the upper fibers of the opposite side.
How is the trapezius muscle tested?
By shrugging the shoulder against resistance.
What muscle is involved in pulling on the inferior angle of the scapula?
Serratus anterior.
Fill in the blank: The upper fibers of the trapezius can elevate the whole scapula or prevent its _______.
depression.
What is the shape of the aponeurotic area of the trapezius muscle?
Diamond shape.
What action do the lowest four digitations of serratus anterior assist with?
Scapular rotation.
Where do the middle fibers of the trapezius insert?
Along the medial border of the scapula.
What is the insertion point for the part of the trapezius arising from the lower thoracic spines?
The medial end of the spine of the scapula.
