Neural Exam - 3 month reflexes - deep tendon reflexes

From Embryology
This infant is almost 3 months old.
  • One of the main obstacles to obtaining deep tendon reflexes at this age is catching the extremity at rest.
  • Positioning the extremity is also important.
  • As demonstrated in this baby, a crossed adductor can be seen at this age and still be normal but should not persist beyond 7 months of age.
  • A few beats of ankle clonus can be normal in the first few weeks of life but sustained ankle clonus at any age is abnormal.



Links: MP4 version

3 Months Neural Exam Movies: normal behaviour | cranial nerves | Tone - head and trunk control | upper extremity‎ | hand movements | lower extremity Positions - supine | prone | ventral suspension | vertical suspension | Reflexes - Deep tendon reflexes | Plantar reflex‎ | Root | Moro | Galant | Grasp | Asymmetric tonic neck‎ | Neural Exam Movies | Neonatal Diagnosis
Movie Source - Paul D. Larsen  
Movies from the PediNeuroLogic Exam website are used by permission of Paul D. Larsen, M.D., University of Nebraska Medical Center and Suzanne S. Stensaas, Ph.D., University of Utah School of Medicine. Additional materials were drawn from resources provided by Alejandro Stern, Stern Foundation, Buenos Aires, Argentina; Kathleen Digre, M.D., University of Utah; and Daniel Jacobson, M.D., Marshfield Clinic, Wisconsin. The movies are licensed under a Creative Commons Attribution-NonCommerical-ShareAlike 2.5 License.
Links: Neural Exam Movies | Movies



Cite this page: Hill, M.A. 2017 Embryology Neural Exam - 3 month reflexes - deep tendon reflexes. Retrieved September 24, 2017, from https://embryology.med.unsw.edu.au/embryology/index.php/Neural_Exam_-_3_month_reflexes_-_deep_tendon_reflexes

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© Dr Mark Hill 2017, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G