Class notes
Superficial Back Muscles Study Guide for Exam
- Course
- Institution
- Book
This is a study guide covering the most important information seen on exams about the superficial back muscles
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
More summaries for
-
Exam (elaborations) HAN1323 Human Anatomy practice questions with correct answers
-
Clinical Human Anatomy - Simulation 2 Comprehensive study Guide
-
Upper Limb Practice Exam for Anatomy and Physiology
Seller
Follow
georgievaphx
Content preview
Superficial Back Muscles Exam Study GuideThree groups: superficial, intermediate and deep
- Superficial – responsible for moving the shoulder.
- Intermediate – responsible for moving the thoracic cage.
- Deep – responsible for moving the vertebral column.
The deep muscles are intrinsic muscles because embryologically they develop in the back. The
superficial and intermediate muscles are extrinsic muscles because they do not develop in the
back.
The superficial back muscles lie under the skin, as well as under the superficial fascia. Their
origin comes from the vertebral column. They attach to the bones located in the shoulder –
clavicle, scapula and humerus. These muscles are responsible for moving the upper limb of the
body.
The muscles that make up the superficial back muscles are the latissimus dorsi, levator scapulae
and rhomboids. The most superficial are the trapezius and the latissimus dorsi. The trapezius
covers both the rhomboids and the levator scapulae.
Trapezius muscle - flat, triangular in shape, broad. Its origin comes from the skull, ligamentum
nuchae and spinous processes of the cerebral vertebrae 7 through thoracic vertebrae 12. The
trapezius fibres attach to the scapula, clavicle and the acromion. It is innervated by the accessory
nerve (motor) and receives proprioceptor fibres from the spinal nerves C3 and C4. The actions of
the trapezius muscle are elevation of the scapula and rotation during abduction of the arm per-
formed by the upper fibres. It also retracts the scapula with the middle fibres and pulls the
scapula inferiorly with its lower fibres.
Latissimus Dorsi - its origin is in the lower back, where it covers a vast area. It is attached to the
spinous processes T6-T12, thoracolumbar fascia, iliac crest and the three inferior ribs. Its fibres
come together to make up a tendon, which attaches to the intertubercular sulcus of the humerus.
The latissimus dorsi originates from the lower part of the back, where it covers a wide area.
Latissumus dorsi is innervated by the thoracodorsal nerve. Its actions are to extend, adduct and
medially rotate the upper limbs.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller georgievaphx. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $2.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
49497 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now