LEARN MORE...

Anatomy.edited

Content type

User Generated

Subject

Anatomy

School

Pasadena City College

Type

Homework

Uploaded By

qrkqrk07

Pages

Showing Page:

1/3

Surname 1

Student’s Name

Professor’s Name

Course

Anatomy

The external intercostal muscle could help for more profound inspiration.

These muscles cover the eleven intercostal spaces on either side of the ribs but from the

outer side, unlike internal intercostal muscles. When interior and exterior intercostal muscles

combine, the spaces between the ribs are filled, thus providing support to the respiratory system.

External intercostal expand and raise the sternum by expanding the thoracic cage. During forced

inspiration, the muscles grow the ribs, thus causing an increase in the anteroposterior and

transversal diameter of the lungs. Consequently, the intrapleural pressure decreases, thus

expanding the lungs to permit air to enter the lungs. Therefore, the external intercostal muscle will

be of more help than the other muscle, which can only facilitate expiration.

Internal intercostal

This is a group of muscles found between the ribs, and their number is equivalent to the

intercostal spaces, which are eleven in number on each side of the ribs. Internal intercostal form

part of the thoracic wall muscles located in the intercostal spaces. These muscles share functions

with other muscles located in the intercostal spaces. Therefore, together with innermost and

external intercostals assist breathing and support the thoracic cage integrity. When the internal

intercostal depress the ribs, the thoracic cavity diameter shrinks due to forced expiration; thus, the

air is pushed out of the lungs. On the other hand, external intercostal back up this function by

raising the ribs. Internal intercostal muscles are the most important during the singing and normal

speech since they force air out through the nose and mouth.

Showing Page:

2/3

Surname 2

Transversus thoracis

This is a tendon and thin band of muscle emanating at the sternum from the surface of the

lower posterior and is supplied with blood from the intercostal arteries both anterior and posterior

(Satoru 557). Transversus thoracis forms an essential accessory of respiration since its action

causes the ribs to contract, thus supporting expiration.

External oblique

External oblique muscles are located on the anterior and lateral abdominal parts. This is

one of the outermost muscles of the abdomen that stretches from the lower part of the ribs to the

pelvis (Hamilton 529). External oblique muscle causes an increase in intra-abdominal pressure by

compressing the abdominal cavity and pulling the chest cavity downwards. This action of the

muscles helps perform contralateral rotation and side bending and laterally and anteriorly flexing

the trunk. External oblique muscles also assist during expiration by contracting the ribs.

Showing Page:

3/3

Unformatted Attachment Preview

Surname 1 Student’s Name Professor’s Name Course Anatomy The external intercostal muscle could help for more profound inspiration. These muscles cover the eleven intercostal spaces on either side of the ribs but from the outer side, unlike internal intercostal muscles. When interior and exterior intercostal muscles combine, the spaces between the ribs are filled, thus providing support to the respiratory system. External intercostal expand and raise the sternum by expanding the thoracic cage. During forced inspiration, the muscles grow the ribs, thus causing an increase in the anteroposterior and transversal diameter of the lungs. Consequently, the intrapleural pressure decreases, thus expanding the lungs to permit air to enter the lungs. Therefore, the external intercostal muscle will be of more help than the other muscle, which can only facilitate expiration. Internal intercostal ...
Purchase document to see full attachment

Tags: inspiration internal intercostal muscles sternum thoracic cage