Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off
Reading...
Front

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key

image

Play button

image

Play button

image

Progress

1/11

Click to flip

11 Cards in this Set

  • Front
  • Back
ATLANTO-OCCIPITAL JOINTS

-what forms the "oblong synovial A-O joints"

-what actions does it permit?
I. Atlanto-occipital Joints

A. The convex articular surfaces ofthe occipital condyles and the reciprocally
concave superior articular surfaces ofthe atlas form oblong synovial atlanto-
occipital joints that permit flexion, extension, and lateral flexion ofthe head,
but not rotation
ATLANTO-OCCIPITAL JOINTS

ANTERIOR A-O MEMBRANE
I. Atlanto-occipital Joints

B. The anterior atlanto-occipital membrane is a fibrous joint between the
anterior arch ofthe atlas and anterior margin of foramen magnum; it is
reinforced in the midline by the superior end ofthe anterior longitudinal
ligament
ATLANTO-OCCIPITAL JOINTS

POSTERIOR A-O MEMBRANE
I. Atlanto-occipital Joints

C. The posterior atlanto-occipital membrane is a fibrous joint between the pos-
terior arch ofthe atlas and posterior margin of foramen magnum; it is pene-
trated by the vertebral artery and suboccipital nerve
ATLANTO-AXIAL JOINTS

LATERAL A-A JOINTS
II. Atlantoaxial Joints

A. Lateral atlantoaxial joints: synovial joints between the superior articular
surfaces ofthe axis and the Inferior articular surfaces ofthe atlas
ATLANTO-AXIAL JOINTS

MEDIAN A-A JOINTS
B. Median atlantoaxial joints

1. Anterior joint: synovial joint between the posterior surface ofthe ante-
rior arch ofthe atlas and the anterior surface ofthe dens
MEDIAN ANTLANTOAXIAL JOINTS

POSTERIOR JOINT
-actions permitted? not?
B. Median atlantoaxial joints

2. Posterior joint: synovial joint between the posterior surface ofthe dens
and the anterior surface ofthe transverse ligament ofthe atlas; the transverse ligament ofthe atlas arches behind the dens and attaches on each
side to the atlas

C. Permit rotation ofthe head, but not flexion, extension, or lateral flexion
MEMBRANA TECTORIA

-what does it represent?
-what does it form?
-where does it lie?
III. Fibrous Joints Between
the Axis and Occipital Bone

A. Membrana tectoria

1. Represents the superior end ofthe posterior longitudinal ligament; forms
a fibrous joint between the posterior surface of the body of the axis and
the superior surface ofthe basilar part ofthe occipital bone

2. Lies external to the spinal and cranial dura mater
CRUCIFORM OF THE ATLAS

-formed by?
B. Cruciform ligament ofthe atlas

1. Formed by the transverse ligament ofthe atlas and an inferior and a
superior longitudinal band
CRUCIFORM OF THE ATLAS

-inferior longitudinal band
-superior longitudinal band
B. Cruciform ligament ofthe atlas

2. The inferior longitudinal band extends from the posterior surface ofthe
body ofthe axis to the posterior surface ofthe dens; the superior longi-
tudinal band extends from the posterior surface ofthe dens to the supe-
rior surface ofthe basilar part ofthe occipital bone. external to the
membrana tectoria
APICAL LIGAMENT OF THE DENS
III. Fibrous Joints Between the Axis and Occipital Bone

C. Apical ligament of the dens: slender strand extending from tlie tip of the
dens to the anterior margin of foramen magnum; lies between tlie superior
longitudinal band ofthe cruciform ligament ofthe atlas and the anterior
atlanto-occipital membrane
ALAR LIGAMENTS
III. Fibrous Joints Between the Axis and Occipital Bone

D. Alar ligaments: stout cords extending like wings from either side ofthe dens
to the medial sides ofthe occipital condyles; prevent excessive rotation at
the atlantoaxial joints