Which of the following correctly describes the needle pathway for an MSA injection?
A) The needle advances distal to the second premolar through thin mucosal tissue to superficial fascia consisting of dense connective tissue, microvasculature, and nerve endings.
B) The needle advances parallel to the long axis of the first premolar through thin mucosal tissue to superficial fascia consisting of loose connective tissue, microvasculature, and nerve endings.
C) The needle advances parallel to the long axis of the second premolar through thin mucosal tissue to superficial fascia consisting of loose connective tissue, microvasculature, and nerve endings.
D) The needle advances perpendicular to the long axis of the second premolar at the height of the mucobuccal fold through thin mucosal tissue to superficial fascia consisting of loose connective tissue, microvasculature, and nerve endings.

Question

Quizplus · Accepted Answer

The correct pathway for a Middle Superior Alveolar (MSA) injection involves advancing the needle parallel to the long axis of the second premolar, through thin mucosal tissue to reach the superficial fascia, which is characterized by loose connective tissue, microvasculature, and nerve endings. This technique is used to anesthetize the maxillary premolars (and sometimes the mesiobuccal root of the first molar) by targeting the middle superior alveolar nerve.

Which of the Following Correctly Describes the Needle Pathway for an MSA